English RNA is printed in the USA and Belgium. If you're in the USA, probably you're getting made-in-USA product. If you're in the UK, probably you're getting made-in-Belgium product. I'm not sure about other regions, but it will say in the fine print on the booster pack.
First, let's do a short overview of US product. There are four common print runs, A, B, C1, and C2. Packs have 2xA + 2xB + 6xC1 or 3xA + 2xB + 5xC1 or 4xA + 2xB + 4xC2 or 4xA + 3xB + 3xC2 or 4xA + 4xB + 2xC2. Foils can displace a common from A, B, or C2 depending on rarity. (It won't create a gap in the sequence, the sequence will just be shorter.) Foils only displace A if there were 4 to begin with (so 1xA is not possible even if there is a foil).
A is white/blue/red and B is green/black which helps you get a common of every color in most packs, but unlike GRN, there are now some multicolor cards in A and B.
Runs are mutual exclusive except one card appears in both C1 and C2. This card is also short-printed. Here, that card is Senate Griffin.
Savage Smash
Slimebind
Vizkopa Vampire
Arrester's Admonition
Scorchmark
Haazda Officer
Persistent Petitioners
Rubblebelt Runner
Prowling Caracal
Shimmer of Possibility
Storm Strike
Bring to Trial
Coral Commando
Feral Maaka
Concordia Pegasus
Thought Collapse
Spear Spewer
Tenth District Veteran
Faerie Duelist
Ghor-Clan Wrecker
Civic Stalwart
Quench
Rubble Slinger
Impassioned Orator
Humongulus
Gravel-Hide Goblin
Vizkopa Vampire
Sage's Row Savant
Rubblebelt Recluse
Knight of Sorrows
Slimebind
Spikewheel Acrobat
Haazda Officer
Arrester's Admonition
Savage Smash
Twilight Panther
Persistent Petitioners
Scorchmark
Bring to Trial
Thought Collapse
Rubblebelt Runner
Tenth District Veteran
Prying Eyes
Spear Spewer
Concordia Pegasus
Quench
Rubble Slinger
Arrester's Zeal
Shimmer of Possibility
Feral Maaka
Knight of Sorrows
Coral Commando
Gravel-Hide Goblin
Prowling Caracal
Humongulus
Storm Strike
Civic Stalwart
Faerie Duelist
Ghor-Clan Wrecker
Impassioned Orator
Prying Eyes
Spikewheel Acrobat
Twilight Panther
Sage's Row Savant
Rubblebelt Recluse
Arrester's Zeal
Gift of Strength
Thirsting Shade
Territorial Boar
Rakdos Trumpeter
Open the Gates
Carrion Imp
Rampaging Rendhorn
Dead Revels
Sauroform Hybrid
Undercity Scavenger
Sagittars' Volley
Noxious Groodion
Steeple Creeper
Rakdos Roustabout
Stony Strength
Undercity's Embrace
Territorial Boar
Plague Wight
Axebane Beast
Rakdos Trumpeter
Gift of Strength
Footlight Fiend
Rampaging Rendhorn
Consign to the Pit
Open the Gates
Thirsting Shade
Mammoth Spider
Noxious Groodion
Stony Strength
Dead Revels
Sauroform Hybrid
Undercity Scavenger
Sagittars' Volley
Rakdos Roustabout
Sylvan Brushstrider
Carrion Imp
Steeple Creeper
Undercity's Embrace
Gift of Strength
Footlight Fiend
Open the Gates
Consign to the Pit
Territorial Boar
Plague Wight
Axebane Beast
Dead Revels
Rampaging Rendhorn
Rakdos Trumpeter
Mammoth Spider
Undercity Scavenger
Sylvan Brushstrider
Thirsting Shade
Stony Strength
Undercity's Embrace
Sauroform Hybrid
Rakdos Roustabout
Steeple Creeper
Carrion Imp
Sagittars' Volley
Noxious Groodion
Sylvan Brushstrider
Plague Wight
Axebane Beast
Footlight Fiend
Mammoth Spider
Consign to the Pit
Deface
Gateway Plaza
Applied Biomancy
Root Snare
Azorius Locket
Syndicate Messenger
Clear the Mind
Rafter Demon
Skewer the Critics
Bladebrand
Titanic Brawl
Growth Spiral
Expose to Daylight
Grotesque Demise
Sphinx's Insight
Burn Bright
Senate Courier
Azorius Knight-Arbiter
Gruul Locket
Frenzied Arynx
Orzhov Locket
Deface
Skitter Eel
Wrecking Beast
Scuttlegator
Applied Biomancy
Gateway Plaza
Debtors' Transport
Simic Locket
Grasping Thrull
Syndicate Messenger
Root Snare
Rafter Demon
Azorius Locket
Bladebrand
Skewer the Critics
Growth Spiral
Clear the Mind
Sphinx's Insight
Grotesque Demise
Expose to Daylight
Titanic Brawl
Azorius Knight-Arbiter
Burn Bright
Grasping Thrull
Skitter Eel
Debtors' Transport
Orzhov Locket
Frenzied Arynx
Gruul Locket
Wrecking Beast
Senate Courier
Scuttlegator
Senate Griffin
Simic Locket
Justiciar's Portal
Get the Point
Catacomb Crocodile
Chillbringer
Rubble Reading
Blade Juggler
Watchful Giant
Final Payment
Ill-Gotten Inheritance
Burning-Tree Vandal
Aeromunculus
Rakdos Locket
Chillbringer
Rubble Reading
Summary Judgment
Saruli Caretaker
Lawmage's Binding
Goblin Gathering
Blade Juggler
Justiciar's Portal
Final Payment
Act of Treason
Imperious Oligarch
Ill-Gotten Inheritance
Get the Point
Watchful Giant
Aeromunculus
Goblin Gathering
Senate Griffin
Catacomb Crocodile
Summary Judgment
Saruli Caretaker
Chillbringer
Rubble Reading
Lawmage's Binding
Rakdos Locket
Burning-Tree Vandal
Catacomb Crocodile
Imperious Oligarch
Act of Treason
Get the Point
Justiciar's Portal
Final Payment
Rakdos Locket
Blade Juggler
Goblin Gathering
Summary Judgment
Saruli Caretaker
Aeromunculus
Ill-Gotten Inheritance
Lawmage's Binding
Act of Treason
Imperious Oligarch
Watchful Giant
Burning-Tree Vandal
Now, a quick overview of Belgian product. Packs will have 6 cards from A followed by 4 from B. A foil can shorten either run by one card. There is a strong color pattern in A, but again, unlike GRN, there are some multicolor cards in A as well.
Again, the runs are mutually exclusive except for one card which is also short-printed. For this printing, it's Grasping Thrull.
Probably all Ultimate Masters is printed in Japan by the same printer, so probably there are no regional collation difference (like there are for Standard-legal sets). But since the pack structure will be a little different that what we normal see in packs from the USA or Belgium.
Treasure Cruise
Scuzzback Marauders
Aethersnipe
Mad Prophet
Just the Wind
Wingsteed Rider
Rune Snag
Canker Abomination
Stitcher’s Apprentice
Hissing Iguanar
Whirlwind Adept
Hyena Umbra
Frantic Search
Fire / Ice
Flight of Fancy
Satyr Wayfinder
Sultai Skullkeeper
Cathodion
Think Twice
Reckless Wurm
Rune Snag
Faith’s Fetters
Skywing Aven
Fiery Temper
Aethersnipe
Terramorphic Expanse
Treasure Cruise
Stitched Drake
Scuzzback Marauders
Deranged Assistant
Mad Prophet
Archaeomancer
Wingsteed Rider
Whirlwind Adept
Fire / Ice
Think Twice
Reckless Wurm
Stitcher’s Apprentice
Hyena Umbra
Flight of Fancy
Canker Abomination
Frantic Search
Satyr Wayfinder
Just the Wind
Cathodion
Rune Snag
Hissing Iguanar
Sultai Skullkeeper
Hyena Umbra
Skywing Aven
Fiery Temper
Aethersnipe
Terramorphic Expanse
Deranged Assistant
Stitched Drake
Scuzzback Marauders
Treasure Cruise
Mad Prophet
Archaeomancer
Faith’s Fetters
Whirlwind Adept
Canker Abomination
Frantic Search
Hissing Iguanar
Think Twice
Wingsteed Rider
Flight of Fancy
Cathodion
Just the Wind
Satyr Wayfinder
Skywing Aven
Fire / Ice
Stitcher’s Apprentice
Reckless Wurm
Archaeomancer
Hyena Umbra
Sultai Skullkeeper
Fiery Temper
Aethersnipe
Scuzzback Marauders
Treasure Cruise
Stitched Drake
Terramorphic Expanse
Deranged Assistant
Reckless Wurm
Just the Wind
Faith’s Fetters
Whirlwind Adept
Canker Abomination
Rune Snag
Mad Prophet
Think Twice
Wingsteed Rider
Flight of Fancy
Cathodion
Stitcher’s Apprentice
Satyr Wayfinder
Frantic Search
Fire / Ice
Archaeomancer
Hissing Iguanar
Sultai Skullkeeper
Faith’s Fetters
Skywing Aven
Fiery Temper
Deranged Assistant
Terramorphic Expanse
Stitched Drake
Crow of Dark Tidings
Miming Slime
Walker of the Grove
Ghoulcaller’s Accomplice
Wild Mongrel
Foil
Grave Scrabbler
Groundskeeper
Gurmag Angler
Eel Umbra
Crushing Canopy
Slum Reaper
Hooting Mandrills
Death Denied
Sanitarium Skeleton
Verdant Eidolon
Gurmag Angler
Basking Rootwalla
Fume Spitter
Patchwork Gnomes
Kodama’s Reach
Twins of Maurer Estate
Defy Gravity
Staunch-Hearted Warrior
Olivia’s Dragoon
Offalsnout
Shed Weakness
Dark Dabbling
Wickerbough Elder
Mark of the Vampire
Golgari Brownscale
Pulse of Murasa
Moan of the Unhallowed
Miming Slime
Unholy Hunger
Bloodflow Connoisseur
Groundskeeper
Last Gasp
Spider Umbra
Basking Rootwalla
Grave Scrabbler
Wild Mongrel
Foil
Ghoulcaller’s Accomplice
Prey Upon
Crow of Dark Tidings
Defy Gravity
Walker of the Grove
Slum Reaper
Hooting Mandrills
Twins of Maurer Estate
Sanitarium Skeleton
Verdant Eidolon
Olivia’s Dragoon
Groundskeeper
Offalsnout
Patchwork Gnomes
Kodama’s Reach
Mark of the Vampire
Eel Umbra
Crushing Canopy
Last Gasp
Death Denied
Basking Rootwalla
Dark Dabbling
Hooting Mandrills
Bloodflow Connoisseur
Prey Upon
Staunch-Hearted Warrior
Moan of the Unhallowed
Spider Umbra
Unholy Hunger
Fume Spitter
Golgari Brownscale
Crow of Dark Tidings
Miming Slime
Pulse of Murasa
Ghoulcaller’s Accomplice
Wild Mongrel
Defy Gravity
Twins of Maurer Estate
Walker of the Grove
Gurmag Angler
Foil
Verdant Eidolon
Slum Reaper
Wickerbough Elder
Grave Scrabbler
Sanitarium Skeleton
Crushing Canopy
Olivia’s Dragoon
Shed Weakness
Patchwork Gnomes
Death Denied
Kodama’s Reach
Offalsnout
Eel Umbra
Staunch-Hearted Warrior
Moan of the Unhallowed
Fume Spitter
Golgari Brownscale
Dark Dabbling
Wickerbough Elder
Mark of the Vampire
Prey Upon
Pulse of Murasa
Last Gasp
Spider Umbra
Bloodflow Connoisseur
Unholy Hunger
Shed Weakness
Molten Birth
Ulamog’s Crusher
Tethmos High Priest
Akroan Crusader
Mammoth Umbra
Repel the Darkness
Raid Bombardment
Dimir Guildmage
Resurrection
Faithless Looting
Vessel of Endless Rest
Conviction
Generator Servant
Safehold Elite
Lotus-Eye Mystics
Reckless Charge
Shielding Plax
Wandering Champion
Arena Athlete
Myr Servitor
Ronom Unicorn
Ingot Chewer
Dimir Guildmage
Mammoth Umbra
Thermo-Alchemist
Double Cleave
Heliod’s Pilgrim
Nightbird’s Clutches
Turn to Mist
Tethmos High Priest
Sparkspitter
Martyr of Sands
Generator Servant
Repel the Darkness
Undying Rage
Ulamog’s Crusher
Skyspear Cavalry
Raid Bombardment
Beckon Apparition
Gods Willing
Akroan Crusader
Lotus-Eye Mystics
Icatian Crier
Molten Birth
Rakdos Shred-Freak
Mammoth Umbra
Soul’s Fire
Safehold Elite
Conviction
Reckless Charge
Dimir Guildmage
Angelic Renewal
Thermo-Alchemist
Vessel of Endless Rest
Tethmos High Priest
Arena Athlete
Shielding Plax
Resurrection
Nightbird’s Clutches
Myr Servitor
Gods Willing
Faithless Looting
Ulamog’s Crusher
Heliod’s Pilgrim
Ingot Chewer
Rakdos Shred-Freak
Lotus-Eye Mystics
Akroan Crusader
Martyr of Sands
Undying Rage
Ronom Unicorn
Soul’s Fire
Double Cleave
Angelic Renewal
Raid Bombardment
Shielding Plax
Icatian Crier
Sparkspitter
Repel the Darkness
Wandering Champion
Molten Birth
Turn to Mist
Ronom Unicorn
Faithless Looting
Safehold Elite
Conviction
Generator Servant
Beckon Apparition
Skyspear Cavalry
Undying Rage
Rakdos Shred-Freak
Wandering Champion
Reckless Charge
Double Cleave
Resurrection
Nightbird’s Clutches
Vessel of Endless Rest
Heliod’s Pilgrim
Thermo-Alchemist
Myr Servitor
Angelic Renewal
Ingot Chewer
Turn to Mist
Icatian Crier
Sparkspitter
Martyr of Sands
Arena Athlete
Gods Willing
Soul’s Fire
Beckon Apparition
Skyspear Cavalry
Each pack has 10 commons. Packs are either 2A + 4B + 4C, 3A + 3B + 4C, or 3A + 4B + 3C. There are all about equally likely (the math says it should be 33 : 34 : 34 if I am not mistaken). Run A has 27 distinct cards each repeated 4 times. Runs B and C each have 37 distinct cards repeated 3 times each. There are no overlaps between the runs. The colors are not split completely cleanly, but A is mostly Blue, B is mostly Green and Black, and C is mostly Red and White.
The fact that the B and C runs have the same total length plus appear at the same rate in the packs suggests that the position in these runs could be correlated, but this idea so far hasn't really borne out as far as I can tell.
For sheet math, my guess is that 110-card sheets are in use. I've also looked at Battlebond (also printed in Japan) which similarly shows a preference for 110 (or 111), but curiously, Battlebond print runs break down differently. Battlebond is 4 runs per pack with sheets of 37 x 3, 22 x 5, 22 x 5, and 20 x 5 cards. The 111 number seems to be at odds with the 110 hypothesis, but 111 doesn't have any good divisors, and use of 110-card sheets is precedented (plus Battlebond hits 110 exactly for some sheets). They may be able to find room for the extra cards on other sheets, or they may have an extra scraps sheet, but all this is just speculation. Anyway, printing the runs in a 3 : 4 : 4 ratio works out perfectly with no under- or over-printed cards.
Empirical data was taken from Booster Demon, Magical Uprising, MTGcard Collector, and Rogue Deckbuilder on YouTube.
Edit:
Adding Uncommon info since it is more useful in this set than usual. There are two runs A and B. Packs either have 1A + 2B or 0A + 3B. The former is much more common. The math says it should be 9 : 1. This means you can usually tell when a B card is taken and there will still be a B card left to indicate for it (as opposed to the more usual pattern for USA-printed sets where you'll often end up with 1A and 1B left and not know which was taken).
Run A has 24 cards each repeated 4 times. Since there is only one per pack, the print run is not particularly relevant to limited, but I'll list the A cards. Run B has the remaining 56 cards each repeated 2 times.
I actually don't play limited that competitively myself, I just think it's interesting, so please take my suggestions with a grain of salt. (And if anyone has other ideas, feel free to share!)
It looks like some of the most valuable commons in the set are Artful Takedown, Dead Weight, Deadly Visit, Luminous Bonds, and Watcher in the Mist, so I'll focus on those. Of course, it will be important to have a good idea of what cards people are actually likely to first-pick. Especially this can come into play when analyzing false-positives that can occur if someone took another card near your "marker" card (and if the card you were expecting wasn't in the pack to begin with anyway).
Artful Takedown always appears before Sumala Woodshaper in C1. That means if a pack has Sumala Woodshaper, it will also have Artful Takedown about 81% of the time. (This number means that the chance of a false negative -- someone taking Artful Taking but you don't notice because Sumala Woodshaper wasn't in the pack -- is the complement, around 19%. There will be more false negatives for C2 cards because C1 runs in packs are longer.) Also, you can check if there are any other cards first-pickable that occur in a 6-card run with Sumala Woodshaper. These cards could be false positives (meaning that you see Sumala Woodshaper and guess that Artful Takedown was taken, but actually something else was taken). (Maybe Skyknight Legionnaire if anything?) But remember, for a false positive, not only does someone have to pick another card, but also there also can't be an Artful Takedown in the pack which is already somewhat unlikely. There could also be a false positive if someone took a card from A or B, but you can check for yourself and see if there are any cards there that seem first-pickable (and this can be noticed in other ways sometimes like A or B having the wrong number of cards or the wrong color sequence). Also, if the pack is still in order and you see another C2 card before Sumala Woodshaper, then you can be extra sure that Artful Takedown was taken. You don't necessarily have to remember the specific cards to do this. My experience is that just paying attention while opening lots of packs, you can pretty quickly get a good feeling for what cards are in A and B (especially remembering that A is all mono-red/mono-white/mono-blue and B is all mono-green/mono-black). But even if you haven't memorized A and B, just knowing that B is green/black is good enough here since the other cards preceeding Sumala Woodshaper are not mono-green/mono-black.
Dead Weight always appears before Undercity Uprising in C2. Since this is C2, the correlation is a little bit weaker, maybe around 75%. None of the other noted cards are near enough Undercity Uprising to be in the same pack. As before, if Dead Weight is missing, and the other card before Undercity Uprising isn't mono-green/mono-black it is C2, so almost surely Dead Weight is taken.
Deadly Visit appears always next to Izzet Locket in C2, but it can be on either side. Also, note that Watcher in the Mist can also appear in the same pack as Izzet Locket, although it is not as likely. This could cause confusion.
Luminous Bonds doesn't have a consistent neighbor. It does always appear two cards before Piston-Fist Cyclops as you noted. However, this means the correlation is weaker (down to around 63%). Artful Takedown can also appear with Piston-Fist Cyclops, but afterwards. So, if you do see with two C1 cards before it but not Luminous Bonds, then that's pretty sure. But note, one of these cards could be Mephitic Vapors, a mono-black C1 card, so don't confuse it with B. (It can still be obvious for other reasons like if there are non mono-green or mono-black cards between Mephitic Vapors and the rest of the B sequence, or if Mephitic Vapors is the seoncd black card in a row since B usually alternates, or if the supposed B sequence is too long -- it should be 2 B cards with C1, or maybe 1 if there's a foil, although most foils are in C2 packs).
Watcher in the Mist is always next to Pause for Reflection in C2, although it can be on either side. But, note that Pause for Reflection can also appear with Deadly Visit, even without Izzet Locket.
Hopefully this gives a good idea what kind of things to look for. Of course, the more you can keep in your head (even beyond what I've outlined), the more sure you could be of the picks. If someone could memorized the whole sequences, it would be possible to frequently narrow down the possibilities to a single card (barring collation irregularities), and if not a single cards, then no more than maybe 4-6 in the worst case. (And most of those are probably not likely picks.) I guess you can decide for yourself how much you think it helps, and how much is worth trying to remember. Note that much of what I've written isn't stuff you need to remember necessarily rather than justification of why it would be useful. It's important to know that false positives and false negatives can happen, but some of the more detailed info probably isn't useful in the moment.
Also, you can try checking out Nima's videos on YouTube (https://www.youtube.com/user/fooz2916). He hasn't done a video for Guilds of Ravnica (yet?) but his other videos could still give you some idea what kind of things are helpful to look for.
None of these have been posted here in a while, but I calculated it so I thought I'd share in case people are still interested.
This is for physical English USA-printed product. There is generally also English Belgium-printed product (e.g. distributed in the U.K.) that doesn't follow this pattern. This is from only about 3 boxes, so there may be a few transpositions I haven't detected yet.
Healer’s Hawk
Wishcoin Crab
Sure Strike
Collar the Culprit
Dazzling Lights
Fire Urchin
Ledev Guardian
Disdainful Stroke
Barging Sergeant
Tenth District Guard
Leapfrog
Fearless Halberdier
Sworn Companions
Maximize Altitude
Torch Courier
Hunted Witness
Unexplained Disappearance
Cosmotronic Wave
Intrusive Packbeast
Radical Idea
Goblin Locksmith
Loxodon Restorer
Wishcoin Crab
Sure Strike
Righteous Blow
Vedalken Mesmerist
Ornery Goblin
Skyline Scout
Wall of Mist
Wojek Bodyguard
Take Heart
Dimir Informant
Rubblebelt Boar
Collar the Culprit
Passwall Adept
Maximize Velocity
Healer’s Hawk
Dazzling Lights
Fire Urchin
Intrusive Packbeast
Maximize Altitude
Barging Sergeant
Tenth District Guard
Disdainful Stroke
Torch Courier
Hunted Witness
Vedalken Mesmerist
Fearless Halberdier
Righteous Blow
Leapfrog
Goblin Locksmith
Ledev Guardian
Unexplained Disappearance
Cosmotronic Wave
Sworn Companions
Wall of Mist
Wojek Bodyguard
Take Heart
Radical Idea
Ornery Goblin
Loxodon Restorer
Dimir Informant
Rubblebelt Boar
Skyline Scout
Passwall Adept
Maximize Velocity
Crushing Canopy
Barrier of Bones
Generous Stray
Bartizan Bats
Devkarin Dissident
Vicious Rumors
Vigorspore Wurm
Severed Strands
Wild Ceratok
Child of Night
Urban Utopia
Burglar Rat
Wary Okapi
Moodmark Painter
Hitchclaw Recluse
Douser of Lights
Pack’s Favor
Veiled Shade
Kraul Foragers
Bartizan Bats
Portcullis Vine
Never Happened
Crushing Canopy
Barrier of Bones
Devkarin Dissident
Vicious Rumors
Generous Stray
Severed Strands
Wild Ceratok
Spinal Centipede
Vigorspore Wurm
Burglar Rat
Pack’s Favor
Child of Night
Urban Utopia
Bartizan Bats
Portcullis Vine
Douser of Lights
Kraul Foragers
Moodmark Painter
Wary Okapi
Veiled Shade
Vigorspore Wurm
Never Happened
Hitchclaw Recluse
Barrier of Bones
Devkarin Dissident
Vicious Rumors
Crushing Canopy
Severed Strands
Generous Stray
Spinal Centipede
Wild Ceratok
Child of Night
Wary Okapi
Douser of Lights
Urban Utopia
Moodmark Painter
Pack’s Favor
Veiled Shade
Kraul Foragers
Burglar Rat
Portcullis Vine
Never Happened
Hitchclaw Recluse
Spinal Centipede
Gravitic Punch
Dimir Locket
Centaur Peacemaker
Darkblade Agent
Devious Cover-Up
Erstwhile Trooper
Skyknight Legionnaire
Whisper Agent
Candlelight Vigil
Sonic Assault
Rhizome Lurcher
Fresh-Faced Recruit
Mephitic Vapors
Blade Instructor
Command the Storm
Capture Sphere
Golgari Locket
Maniacal Rage
Hired Poisoner
Vernadi Shieldmate
Hypothesizzle
Prey Upon
Hammer Dropper
Dimir Locket
Luminous Bonds
Candlelight Vigil
Piston-Fist Cyclops
Pitiless Gorgon
Fresh-Faced Recruit
Artful Takedown
Sumala Woodshaper
Devious Cover-Up
Rhizome Lurcher
Skyknight Legionnaire
Darkblade Agent
Centaur Peacemaker
Whisper Agent
Capture Sphere
Erstwhile Trooper
Maniacal Rage
Hired Poisoner
Blade Instructor
Sonic Assault
Golgari Locket
Command the Storm
Mephitic Vapors
Luminous Bonds
Vernadi Shieldmate
Piston-Fist Cyclops
Pitiless Gorgon
Hammer Dropper
Artful Takedown
Sumala Woodshaper
Hypothesizzle
Prey Upon
Gravitic Punch
Watcher in the Mist
Pause for Reflection
Rosemane Centaur
Izzet Locket
Deadly Visit
Ironshell Beetle
Parhelion Patrol
Garrison Sergeant
Muse Drake
Selesnya Locket
Dead Weight
Undercity Uprising
Direct Current
Gateway Plaza
Goblin Electromancer
Siege Wurm
Boros Locket
Notion Rain
Pause for Reflection
Watcher in the Mist
Selesnya Locket
Direct Current
Izzet Locket
Deadly Visit
Ironshell Beetle
Rosemane Centaur
Garrison Sergeant
Muse Drake
Gateway Plaza
Dead Weight
Undercity Uprising
Parhelion Patrol
Boros Locket
Siege Wurm
Goblin Electromancer
Notion Rain
Selesnya Locket
Watcher in the Mist
Pause for Reflection
Rosemane Centaur
Garrison Sergeant
Deadly Visit
Izzet Locket
Direct Current
Ironshell Beetle
Muse Drake
Gateway Plaza
Dead Weight
Undercity Uprising
Parhelion Patrol
Boros Locket
Siege Wurm
Goblin Electromancer
Notion Rain
The 5/6 short-print is Gravitic Punch.
For people new to collation, here's an overview. (Note, this is mostly the same for all large sets since Shards of Alara.) Basically, half of packs contains A, B, and C1, and the other half contain A, B, and C2. C1 packs generally have 2-3 cards from A, then 2 cards B, then 5-6 cards from C1. C2 packs generally have 4 cards from A, 2 cards from B (but occasionally 3 or 4), and 2-4 cards from C2. If there is a foil, one of the runs will be shorter (although I've never seen A go down to 1 card).
In this set, A contains White, Blue and Red cards and B contains Green and Black cards. The colors follow a repeating pattern. C1 and C2 contain multi-colored cards, colorless cards, and the remainder of the mono-colored commons. Generally, the stronger limited commons tend to be in C1 and C2, but exceptions can apply.
The way the sheet math works is that there are two 11 by 11 sheets. The first sheet contains run A (66 cards) and run C1 (55 cards). Run A consists of 33 distinct cards each appearing twice, and C1 consists of 27 distinct cards each appearing twice plus one card appearing once. The second sheet contains Run B (66 cards) and run C2 (55 cards). Run B consists of 22 distinct cards each appearing three times, and C2 consists of 18 distinct cards each appearing three times plus another copy of the singleton from C1. The sheets are printed in a 3:2 ratio, so between 3 copies of the first sheet and 2 copies of the second sheet, each common appears 6 times except for the singleton shared between C1 and C2 which only appears 5 times. This is the 5/6 short-print. It is slightly less common than the other commons in the set.
Sometimes packs deviate slightly from the print-runs. The most common deviation is that two adjacent cards can be swapped. (This can also occur between the last card in a run for one pack and the first first card in the same run for the following pack.) This generally seems to happen between the first two cards in a row on the sheet, or, more rarely, between the second and third card in a row. When possible, I've marked runs as "aligned" meaning that the first card I write is (probably) the first card in a row. This means in an aligned sequence, swaps will tend to happen between 1 and 2, 12 and 13, 23 and 24, etc, or more rarely between 2 and 3, 13 and 14, etc.
The next most common error is that sometimes a single card might be skipped. This seems to happen to the last card in a row, so if the run is aligned, it may happen to card 11, 22, 33, etc.
(Info on these errors is pretty new, so I probably don't understand it perfectly yet.)
Thanks to Medussa and Nima for their previous work on collation. I mostly just did grunt work.
Empirical GRN data is taken mostly Bad Boy Gaming and Magic4ever on YouTube.
First, let's do a short overview of US product. There are four common print runs, A, B, C1, and C2. Packs have 2xA + 2xB + 6xC1 or 3xA + 2xB + 5xC1 or 4xA + 2xB + 4xC2 or 4xA + 3xB + 3xC2 or 4xA + 4xB + 2xC2. Foils can displace a common from A, B, or C2 depending on rarity. (It won't create a gap in the sequence, the sequence will just be shorter.) Foils only displace A if there were 4 to begin with (so 1xA is not possible even if there is a foil).
A is white/blue/red and B is green/black which helps you get a common of every color in most packs, but unlike GRN, there are now some multicolor cards in A and B.
Runs are mutual exclusive except one card appears in both C1 and C2. This card is also short-printed. Here, that card is Senate Griffin.
Now, a quick overview of Belgian product. Packs will have 6 cards from A followed by 4 from B. A foil can shorten either run by one card. There is a strong color pattern in A, but again, unlike GRN, there are some multicolor cards in A as well.
Again, the runs are mutually exclusive except for one card which is also short-printed. For this printing, it's Grasping Thrull.
My earlier work: GRN, UMA
You can also check out my new website for more information about collation in RNA and other sets.
Each pack has 10 commons. Packs are either 2A + 4B + 4C, 3A + 3B + 4C, or 3A + 4B + 3C. There are all about equally likely (the math says it should be 33 : 34 : 34 if I am not mistaken). Run A has 27 distinct cards each repeated 4 times. Runs B and C each have 37 distinct cards repeated 3 times each. There are no overlaps between the runs. The colors are not split completely cleanly, but A is mostly Blue, B is mostly Green and Black, and C is mostly Red and White.
The fact that the B and C runs have the same total length plus appear at the same rate in the packs suggests that the position in these runs could be correlated, but this idea so far hasn't really borne out as far as I can tell.
For sheet math, my guess is that 110-card sheets are in use. I've also looked at Battlebond (also printed in Japan) which similarly shows a preference for 110 (or 111), but curiously, Battlebond print runs break down differently. Battlebond is 4 runs per pack with sheets of 37 x 3, 22 x 5, 22 x 5, and 20 x 5 cards. The 111 number seems to be at odds with the 110 hypothesis, but 111 doesn't have any good divisors, and use of 110-card sheets is precedented (plus Battlebond hits 110 exactly for some sheets). They may be able to find room for the extra cards on other sheets, or they may have an extra scraps sheet, but all this is just speculation. Anyway, printing the runs in a 3 : 4 : 4 ratio works out perfectly with no under- or over-printed cards.
Empirical data was taken from Booster Demon, Magical Uprising, MTGcard Collector, and Rogue Deckbuilder on YouTube.
Edit:
Adding Uncommon info since it is more useful in this set than usual. There are two runs A and B. Packs either have 1A + 2B or 0A + 3B. The former is much more common. The math says it should be 9 : 1. This means you can usually tell when a B card is taken and there will still be a B card left to indicate for it (as opposed to the more usual pattern for USA-printed sets where you'll often end up with 1A and 1B left and not know which was taken).
Run A has 24 cards each repeated 4 times. Since there is only one per pack, the print run is not particularly relevant to limited, but I'll list the A cards. Run B has the remaining 56 cards each repeated 2 times.
(This kind of blows up to 110 card sheet theory.)
I actually don't play limited that competitively myself, I just think it's interesting, so please take my suggestions with a grain of salt. (And if anyone has other ideas, feel free to share!)
It looks like some of the most valuable commons in the set are Artful Takedown, Dead Weight, Deadly Visit, Luminous Bonds, and Watcher in the Mist, so I'll focus on those. Of course, it will be important to have a good idea of what cards people are actually likely to first-pick. Especially this can come into play when analyzing false-positives that can occur if someone took another card near your "marker" card (and if the card you were expecting wasn't in the pack to begin with anyway).
Artful Takedown always appears before Sumala Woodshaper in C1. That means if a pack has Sumala Woodshaper, it will also have Artful Takedown about 81% of the time. (This number means that the chance of a false negative -- someone taking Artful Taking but you don't notice because Sumala Woodshaper wasn't in the pack -- is the complement, around 19%. There will be more false negatives for C2 cards because C1 runs in packs are longer.) Also, you can check if there are any other cards first-pickable that occur in a 6-card run with Sumala Woodshaper. These cards could be false positives (meaning that you see Sumala Woodshaper and guess that Artful Takedown was taken, but actually something else was taken). (Maybe Skyknight Legionnaire if anything?) But remember, for a false positive, not only does someone have to pick another card, but also there also can't be an Artful Takedown in the pack which is already somewhat unlikely. There could also be a false positive if someone took a card from A or B, but you can check for yourself and see if there are any cards there that seem first-pickable (and this can be noticed in other ways sometimes like A or B having the wrong number of cards or the wrong color sequence). Also, if the pack is still in order and you see another C2 card before Sumala Woodshaper, then you can be extra sure that Artful Takedown was taken. You don't necessarily have to remember the specific cards to do this. My experience is that just paying attention while opening lots of packs, you can pretty quickly get a good feeling for what cards are in A and B (especially remembering that A is all mono-red/mono-white/mono-blue and B is all mono-green/mono-black). But even if you haven't memorized A and B, just knowing that B is green/black is good enough here since the other cards preceeding Sumala Woodshaper are not mono-green/mono-black.
Dead Weight always appears before Undercity Uprising in C2. Since this is C2, the correlation is a little bit weaker, maybe around 75%. None of the other noted cards are near enough Undercity Uprising to be in the same pack. As before, if Dead Weight is missing, and the other card before Undercity Uprising isn't mono-green/mono-black it is C2, so almost surely Dead Weight is taken.
Deadly Visit appears always next to Izzet Locket in C2, but it can be on either side. Also, note that Watcher in the Mist can also appear in the same pack as Izzet Locket, although it is not as likely. This could cause confusion.
Luminous Bonds doesn't have a consistent neighbor. It does always appear two cards before Piston-Fist Cyclops as you noted. However, this means the correlation is weaker (down to around 63%). Artful Takedown can also appear with Piston-Fist Cyclops, but afterwards. So, if you do see with two C1 cards before it but not Luminous Bonds, then that's pretty sure. But note, one of these cards could be Mephitic Vapors, a mono-black C1 card, so don't confuse it with B. (It can still be obvious for other reasons like if there are non mono-green or mono-black cards between Mephitic Vapors and the rest of the B sequence, or if Mephitic Vapors is the seoncd black card in a row since B usually alternates, or if the supposed B sequence is too long -- it should be 2 B cards with C1, or maybe 1 if there's a foil, although most foils are in C2 packs).
Watcher in the Mist is always next to Pause for Reflection in C2, although it can be on either side. But, note that Pause for Reflection can also appear with Deadly Visit, even without Izzet Locket.
Hopefully this gives a good idea what kind of things to look for. Of course, the more you can keep in your head (even beyond what I've outlined), the more sure you could be of the picks. If someone could memorized the whole sequences, it would be possible to frequently narrow down the possibilities to a single card (barring collation irregularities), and if not a single cards, then no more than maybe 4-6 in the worst case. (And most of those are probably not likely picks.) I guess you can decide for yourself how much you think it helps, and how much is worth trying to remember. Note that much of what I've written isn't stuff you need to remember necessarily rather than justification of why it would be useful. It's important to know that false positives and false negatives can happen, but some of the more detailed info probably isn't useful in the moment.
Also, you can try checking out Nima's videos on YouTube (https://www.youtube.com/user/fooz2916). He hasn't done a video for Guilds of Ravnica (yet?) but his other videos could still give you some idea what kind of things are helpful to look for.
This is for physical English USA-printed product. There is generally also English Belgium-printed product (e.g. distributed in the U.K.) that doesn't follow this pattern. This is from only about 3 boxes, so there may be a few transpositions I haven't detected yet.
The 5/6 short-print is Gravitic Punch.
For people new to collation, here's an overview. (Note, this is mostly the same for all large sets since Shards of Alara.) Basically, half of packs contains A, B, and C1, and the other half contain A, B, and C2. C1 packs generally have 2-3 cards from A, then 2 cards B, then 5-6 cards from C1. C2 packs generally have 4 cards from A, 2 cards from B (but occasionally 3 or 4), and 2-4 cards from C2. If there is a foil, one of the runs will be shorter (although I've never seen A go down to 1 card).
In this set, A contains White, Blue and Red cards and B contains Green and Black cards. The colors follow a repeating pattern. C1 and C2 contain multi-colored cards, colorless cards, and the remainder of the mono-colored commons. Generally, the stronger limited commons tend to be in C1 and C2, but exceptions can apply.
The way the sheet math works is that there are two 11 by 11 sheets. The first sheet contains run A (66 cards) and run C1 (55 cards). Run A consists of 33 distinct cards each appearing twice, and C1 consists of 27 distinct cards each appearing twice plus one card appearing once. The second sheet contains Run B (66 cards) and run C2 (55 cards). Run B consists of 22 distinct cards each appearing three times, and C2 consists of 18 distinct cards each appearing three times plus another copy of the singleton from C1. The sheets are printed in a 3:2 ratio, so between 3 copies of the first sheet and 2 copies of the second sheet, each common appears 6 times except for the singleton shared between C1 and C2 which only appears 5 times. This is the 5/6 short-print. It is slightly less common than the other commons in the set.
Sometimes packs deviate slightly from the print-runs. The most common deviation is that two adjacent cards can be swapped. (This can also occur between the last card in a run for one pack and the first first card in the same run for the following pack.) This generally seems to happen between the first two cards in a row on the sheet, or, more rarely, between the second and third card in a row. When possible, I've marked runs as "aligned" meaning that the first card I write is (probably) the first card in a row. This means in an aligned sequence, swaps will tend to happen between 1 and 2, 12 and 13, 23 and 24, etc, or more rarely between 2 and 3, 13 and 14, etc.
The next most common error is that sometimes a single card might be skipped. This seems to happen to the last card in a row, so if the run is aligned, it may happen to card 11, 22, 33, etc.
(Info on these errors is pretty new, so I probably don't understand it perfectly yet.)
Thanks to Medussa and Nima for their previous work on collation. I mostly just did grunt work.
Empirical GRN data is taken mostly Bad Boy Gaming and Magic4ever on YouTube.