Stupid question, but why is this in developing?
But this whole anti-Legacy-stuff is also one of the...
All non-basic hate aka Moons just do nothing against decks with many basic lands. Chalice of the Void or Trinisphere doesn't do anything if the opponent always plays only spells which cost 3+ mana. That means AllInRed is only really good in a meta where many non-basics are played, or the mana-curve is quite low.
The second weakness is the inconsistency of the deck, as it is sometimes simply has no reasonable ratio of screw / mana acceleration / creatures in the starting hand.
The third problem which has been always there is that AllInRed has an incredibly bad mid- and late-game because it only plays from the top. Simple said, AllInRed plays like this: Resolve a card, that wins the game [usually a Moon-Effect]. If that is not enough, play additional cards that screw or stall the opponent and resolve large threats that kill the opponent as quickly as possible. If that does not work, just hope that your opponent misplays, can't calculate combat math, or does crappy things on his side of the field, because otherwise we will probably lose.
[Ok the third part got a lot better cuz of quality improvements in the newer sets]
They have a hard time dealing with our Moon-effects in game 1. We can get in trouble if they have an agressive draw on the play and hit turn 2 Thought-Knot Seer IF we do not hit a turn 1 or 2 Moon-effect + good beatz.
Endbringer or [cardGrim Monolith[/card] can also be really annoying.
[Keep in mind Dismember or Walking Balista vs Magus of the Moon can be devastating]
So basically we lose if we do nothing else we should win.
In g2 + g3 they probably bring in stuff like Ratchet Bomb or All is Dust and still get rekt by our gameplan.
They play 34+ non basic lands and try to win with them -> great news for us. It is possible for them to hit double Mox Diamond + Abrupt Decay or get a really fast Dark Depths online but this just matters if you do nothing and normally they do not play Abrupt Decay main. Punishing Fire can hit our Magus of the Moon but Chalice of the Void on 2 shuts it + Life from the Loam down.
In g2 + g3 they probably bring in Krosan Grip or Tireless Tracker and are still far behind our gameplan.
Almost all our cards are great vs them. Ok a Tarmogoyf or Young Pyromancer or Deathrite Shaman with strong backup and specially if they are on the play can be troublesome to deal with. That said it is very possible that you win turn one if they are unable to Force of Will our disruption.
In g2 + g3 it depends on their colors and plan but probably cut the Planeswalkers and add removal. Maybe add more lands to not get Wasteland out of the game and to play around Daze. Cards like Grim Lavamancer or a timed Ancient Grudge can be devastating if your draw is mediocore.
You have all the tools to lock them out g1 but they might get you if they are on the play on turn 1-2. After sideboarding you have the edge of a more focused gameplan.
[They probably sb Abrupt Decay or Echoing Truth or By Force or Hurkyl's Recall and slow down]
It is possible that they drop Lion's Eye Diamond + Lotus Petal before going off in fear of Chalice of the Void on zero or Trinisphere so Fiery Confluence can not just wreck their goblins kill or deal 6 dmg to prevent an Ad Nauseum kill.
If you have no pressure they can combo through your disruption but Mindbreak Trap is hot when there is a lot of storm so they also need discard.
Note: The % depends on which Version they are playing and your Sideboard = T1 kills or T2 kills if you are unable to lock on the draw really hurt.
Most of them play green/black for some sideboard cards and a few have Natural Order.
Our disruption should be strong vs them but they can swarm us before we do anything and being on the play is huge. Magus of the Moon is stronger than your enchantment cuz of Reclamation Sage + Wirewood Symbiote and sometimes they also have Gaddock Teeg to shut down your Planeswalkers and massremoval.
Keep track of all onboard tricks they can do to avoid blowouts.
They are in big trouble if you drop an early threat supported by a combination of 1-2 removal or disruption even if they bring in Abrupt Decay.
Normally they play two or three basic lands + they are slow. The less basic lands they have the better the matchup but it can be possible to drop fetchland pass and keep Abrupt Decay up for our Moon-effects. If they start with Tarmogoyf and strong backup on the play it is for sure troublesome but overall we are well suited.
If their plan is basic into basic a fast creature heavy start without disruption can seal the deal.
[Keep in mind they probably play Toxic Deluge]
Ok we play Chalice of the Void that can shut down 50% of their deck and Trinisphere to slow them down but also have a lot of weak to dead cards like Blood Moon + Magus of the Moon.
Use your removal aggressive on stuff like Goblin Guide and try to avoid a Price of Progress blowout + Eidolon of the Great Revel can be worse for them as it is for us in a race situation. They probably bring in artifact removal.
Without Sulfur Elemental + Sudden Shock probably unfavorable cuz they are mono colored with Aether Vial and given enough time can deal with any threat + Stoneforge Mystic protected by Mother of Runes is scary.
[That said it is also possible that they start without basiclands]
Try to avoid that their equipments overpower you and do not run into their obvious tricks.
The Flagship of their deck with 1-2 support spells or cards like True-Name Nemesis with any of their equipments overpower us. They can have a slow start and perish cuz of our pressure but this is hard to do if they play like 3-6 basic lands.
We can do almost nothing if they get a turn 1-2 fatty and specially with backup. Tbh all depends on their draw.
[Karakas would be really strong i gues]
Most of your disruption does nothing vs them and Emrakul, the Aeons Torn + Griselbrand laugh about our clock.
You would have to devote too many sb slots to at best have a shot and that is why i just ignore that matchup.
[ok you probably can sb something decent vs reanimator + show and tell like Karakas]
Hopefully they just do nothing.