Creature – Atog
Sworn to Dragons (This creature gets +1/+1 as long as you control a Dragon, or +2/+2 instead as long as you control a legendary Dragon.)
Sacrifice a land: Asmadatog gets +1/+1 and gains trample until end of turn. If you sacrifice a Swamp, Mountain or Forest this way, instead it gets +3/+3 and gains trample and haste until end of turn.
(you are dumb, Brofaux)
Next: WUB (bonus points if it's an artifact Human)
Artifact Creature - Spirit Wall
When ~ enters the battlefield or at the beginning of your upkeep, put a 1/6 white Spirit Wall artifact creature token with defender and flying onto the battlefield.
At the beginning of your end step, each opponent loses life equal to the number of creatures with defender you control. You gain that much life.
Next: another white/black (only) cost that has never appeared on a real card
Aether Whim Sorcery Look at target opponent's hand. You may choose a permanent card from it. If you do, put the chosen card onto the battlefield under your control. When that card enters the battlefield this way, return it to its owner's hand. -minrar: uncommon
Apprentice Sage Creature – Human Wizard t, Sacrifice Apprentice Sage: Draw a card. 1/1 -minrar: common
Chisei’s Waterspout Enchantment At the beginning of your upkeep, put a flood counter on target land you control. Each land you control with a flood counter on it is an Island in addition to its other land types. -minrar: uncommon
Edric’s Familiar Creature – Bird Flying When Edric’s Familiar enters the battlefield, choose target creature. Whenever the chosen creature deals damage to a player this turn, you may draw a card. 0/1 -minrar: common
Flooded Estate Instant As an additional cost to cast Flooded Estate, sacrifice a land. Tap target permanent. Search your library for an Island card and put it onto the battlefield tapped. Then shuffle your library. -minrar: common
Peddler of Deception Creature – Human Spellshaper U,t, Discard a card: Change the text of target permanent by replacing all instances of one color word with another or one basic land type with another. 1/1 -minrar: uncommon
Quiet Façade Enchantment – Aura Enchant creature Enchanted creature gets +0/+2 and has hexproof. When you become the target of a spell, transform Quiet Façade at the beginning of the next end step. // Savage Visage ((R/G)) Enchantment – Aura Enchant creature Enchanted creature gets +2/+2, has trample, and attacks each turn if able. -minrar: uncommon
Creature – Dolphin
When a player casts a Human spell, if he or she doesn't control a basic Island, sacrifice Yangtze Dolphin.
Next: an ultimatum split along its colors, with the option to fuse
EDIT: since these things are hard - GG/WW/U WW/UU/B UU/BB/R BB/RR/G RR/GG/W
The Monster 20
Legendary Creature – Horror
The Monster gets +1/+1 for each mana an opponent spent this turn.
When the Monster enters the battlefield or at the beginning of your upkeep, each opponent exiles a creature he or she controls.
10/10 The one fear in all beings' hearts.
Chant of the Claw 5R Sorcery Affinity for Viashino You may put a Dragon permanent card from your hand onto the battlefield. -minrar: uncommon
Granite Sphinx 5R Creature – Sphinx 2R: Granite Sphinx gains flying until end of turn. Play with your hand revealed. Whenever an opponent casts a spell, target creature you control gets +X/+X and gains trample and haste until end of turn, where X is the number of red cards in your hand. 5/5 -minrar: rare
Greater Sliver 5R
Creature – Sliver
If a Sliver you control would deal damage to a non-Sliver permanent or player, it deals double that damage instead.
Kresh’s Zeal 5R Creature – Elemental Evoke 7/1 -minrar: common
Maraxus’s Command 5R Sorcery Whenever an Ogre enters the battlefield under your control this turn, it deals 1 damage to target creature or player. Put two 3/3 red Ogre creature tokens onto the battlefield. -minrar: uncommon
One Dozen Blades 5R Instant Choose one – Target creature gets +6/+0 until end of turn; or up to three target creatures get +2/+0 until end of turn. Entwine 2R -minrar: common
Plague of Ogres 5R Creature – Ogre Carrier Mutant When Plague of Ogres enters the battlefield, you may put a card named Incurable Ogre from your hand and up to one target card named Incurable Ogre from your graveyard onto the battlefield tapped. 6/2 -minrar: uncommon
Word of Destruction 5R Sorcery Destroy target land. Cipher -minrar: uncommon
Chance Disaster 1RR Sorcery Chance Disaster deals 3 damage to all creatures. Flashback 0 You can't flashback Chance Disaster unless you won a coin flip this turn. -minrar: uncommon
Corrosive Wake 1RR Enchantment Whenever a creature enters the battlefield under your control, it gains infect until end of turn. -minrar: rare
Feral Liminid~ 1RR~
Enchantment Creature – Elemental~
Champion an artifact~
Feral Liminid attacks each turn if able.~
4/3~ Having been imprisoned and exploited for centuries, who could blame their rage?~ -minrar: uncommon
Hivis’s Glory 1RR Enchantment All creatures are Dragons in addition to their other creature types. -minrar: uncommon
Pyromancer Historian 1RR Creature – Human Wizard Spellshaper R,t, Discard a card: Pyromancer Historian deals 2 damage to target creature or player. 4R,t, Exile a card from your graveyard: Pyromancer Historian deals 2 damage to target creature or player. 0/1 -minrar: rare
Skyfire Dragonauts 1RR Creature – Goblin Wizard Whenever you cast an instant or sorcery spell, Skyfire Dragonauts gains flying until end of turn. If that spell is overloaded, Skyfire Dragonauts gets +3/+0 until end of turn. 2/2 -minrar: uncommon
Wicked Broker 1RR Creature – Devil R,t, Sacrifice another creature: Target player gains control of target creature you control. Activate this ability only any time you could cast a sorcery. 1RR,t, Sacrifice another three creatures: Gain control of target creature. Activate this ability only any time you could cast a sorcery. 2/2 -minrar: rare
Zug-Zug, the Brute 1RR Legendary Creature – Goblin Berserker Haste Protection from legendary 3/3 -minrar: rare
Might of the Roil Instant – Might Target creature gets +2/+2 until end of turn. Whenever a nonbasic land enters the battlefield under an opponent’s control, you may return Might of the Roil from your graveyard to your hand. -minrar: uncommon
Next: 5(P/W)(P/W),8(P/U)(P/U),5(P/B)(P/B),3(P/R)(P/R) or 5(P/G)(P/G)
Shun the Uncompleat (P/W)(P/U)(P/B)(P/R)(P/G)
Counter target spell if life wasn't spent or a creature wasn't sacrificed to cast it. Then if your life total is equal to or higher than your starting life total, draw a card.
Phalanx, the Dragon 9 Legendary Creature – Giant Dragon Flying Whenever a creature you control attacks and isn't blocked, return target land to its owner's hand. 1, Discard a legendary Giant card: Phalanx gains hexproof and indestructible until end of turn. 7/7 -minrar: rare
Gift of Time 1UU Sorcery – Temporal Target player other than you takes an extra turn after this one. Draw two cards. -minrar: common
Lanecrash Tarbomander 1UU Creature – Salamander Islandwalk When Lanecrash Tarbomander enters the battlefield, search your library for an Island card and put it onto the battlefield tapped under an opponent’s control. Then shuffle your library. 2/1 -minrar: uncommon
Master Smuggler 1UU Creature – Human Rogue At the beginning of your upkeep, you may look at all cards that are hidden away. When Master Smuggler deals combat damage to a player, you may sacrifice it. If you do, you may play target card that’s hidden away without paying its mana cost. 1/1 -minrar: uncommon
Daywalker BB Creature – Vampire Protection from red spells and from white spells 2/2 -minrar: common
Endrek's Disciple BB
Creature – Human Spellshaper B,t, Discard a card: Put a 1/1 black Thrull creature token named Blood Pet onto the battlefield. That token has “Sacrifice this creature: Add to your mana pool.”
1/1 -minrar: uncommon
Gravelgill Guerrilla BB Creature – Merfolk Assassin Whenever one or more creatures you control become untapped, you may have target creature get -1/-1 until end of turn. 2/1 -minrar: uncommon
Neck-Wringer Hag BB Creature – Hag At the beginning of your upkeep, sacrifice a non-Hag creature. If you do, you gain 1 life. Neck-Wringer Hag gets +2/+0 and has deathtouch as long as it’s the only creature you control. 2/2 -minrar: uncommon
Sadistic Warlock BB Creature – Spellshaper Ally Intimidate B,t, Discard a card: Target creature gets -2/-2 until end of turn. Activate this ability only if an Ally entered the battlefield under your control this turn. 2/1 -minrar: common
Traitor to Carnage BB
Creature – Eldrazi Coward Drone
When Traitor to Carnage enters the battlefield, target opponent gains control of it.
At the beginning of your upkeep, sacrifice another creature. If you can't, sacrifice Traitor to Carnage.
4/4 -minrar: uncommon
Urborg Vengeance BB Instant Target opponent sacrifices a creature for each creature that you controlled that was put into your graveyard this turn. -minrar: rare -reservereprint: Urborg Justice
Zanikev Miser BB
Creature – Harpy Shaman
Each opponent's maximum hand size is reduced by the number of +1/+1 counters on Zanikev Miser.
Next: , miracle [any cost on this page (the higher, the better)]