Put X -1/-1 counters on each creature. Shuffle Black Sun's Zenith into its owner's library.
Artifact spells you cast have convoke. (Your creatures can help cast those spells. Each creature you tap while casting an artifact spell pays for 1 or one mana of that creature's color.)
Cryptborn Horror enters the battlefield with X +1/+1 counters on it, where X is the total life lost by your opponents this turn.
At the beginning of each player's draw step, that player draws an additional card.
Diregraf Ghoul enters the battlefield tapped.
If an instant or sorcery card would be put into a graveyard from anywhere, exile it instead.
Hexproof (This creature can't be the target of spells or abilities your opponents control.)
Dungrove Elder's power and toughness are each equal to the number of Forests you control.
First strike, vigilance
Protection from Vampires, from Werewolves, and from Zombies
When False Prophet dies, exile all creatures.
Battalion — Whenever Firemane Avenger and at least two other creatures attack, Firemane Avenger deals 3 damage to target creature or player and you gain 3 life.
T: Each creature attacks this turn if able.
Whenever Hada Freeblade or another Ally enters the battlefield under your control, you may put a +1/+1 counter on Hada Freeblade.
As Hall of Triumph enters the battlefield, choose a color.
Creatures you control of the chosen color get +1/+1.
Ferocious — Whenever Heir of the Wilds attacks, if you control a creature with power 4 or greater, Heir of the Wilds gets +1/+1 until end of turn.
Put two 1/1 colorless Sliver creature tokens onto the battlefield.
Whenever Kalastria Highborn or another Vampire you control dies, you may pay B. If you do, target player loses 2 life and you gain 2 life.
For each creature, its controller sacrifices it unless he or she pays X life.
T: Untap another target permanent.
Latch Seeker can't be blocked.
When Liliana's Specter enters the battlefield, each opponent discards a card.
Magmaquake deals X damage to each creature without flying and each planeswalker.
Whenever Mardu Shadowspear attacks, each opponent loses 1 life.
Dash 1B (You may cast this spell for its dash cost. If you do, it gains haste, and it's returned from the battlefield to its owner's hand at the beginning of the next end step.)
Play with the top card of your library revealed.
You may cast the top card of your library if it's an instant or sorcery card.
Whenever you cast an instant or sorcery spell from your library, copy it. You may choose new targets for the copy.
When Mitotic Slime dies, put two 2/2 green Ooze creature tokens onto the battlefield. They have "When this creature dies, put two 1/1 green Ooze creature tokens onto the battlefield."
When Mwonvuli Beast Tracker enters the battlefield, search your library for a creature card with deathtouch, hexproof, reach, or trample and reveal it. Shuffle your library and put that card on top of it.
Whenever Mycoid Shepherd or another creature you control with power 5 or greater dies, you may gain 5 life.
Spend only mana produced by creatures to cast Myr Superion.
When you cycle Naya Sojourners or it dies, you may put a +1/+1 counter on target creature.
Cycling 2G (2G, Discard this card: Draw a card.)
Bestow 2BB (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)
Nighthowler and enchanted creature each get +X/+X, where X is the number of creature cards in all graveyards.
Inspired — Whenever Pain Seer becomes untapped, reveal the top card of your library and put that card into your hand. You lose life equal to that card's converted mana cost.
Heroic — Whenever you cast a spell that targets Phalanx Leader, put a +1/+1 counter on each creature you control.
When Priest of Urabrask enters the battlefield, add RRR to your mana pool.
1BB, T: Destroy target tapped nonblack creature.
3, T: Search your library for a Mercenary permanent card with converted mana cost 3 or less and put it onto the battlefield. Then shuffle your library.
When Reclamation Sage enters the battlefield, you may destroy target artifact or enchantment.
At the beginning of your upkeep, you may return target creature card from your graveyard to the battlefield.
Squelching Leeches's power and toughness are each equal to the number of Swamps you control.
Staggershock deals 2 damage to target creature or player.
Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)
Bloodthirst 2 (If an opponent was dealt damage this turn, this creature enters the battlefield with two +1/+1 counters on it.)
Stormblood Berserker can't be blocked except by two or more creatures.
Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)
Return target creature to its owner's hand. You put a token onto the battlefield that's a copy of that creature.
Artifact creatures you control get +2/+2.
When Treasure Mage enters the battlefield, you may search your library for an artifact card with converted mana cost 6 or greater, reveal that card, and put it into your hand. If you do, shuffle your library.
When Trostani's Summoner enters the battlefield, put a 2/2 white Knight creature token with vigilance, a 3/3 green Centaur creature token, and a 4/4 green Rhino creature token with trample onto the battlefield.
Exile target nonland permanent.
GU: This turn, each creature you control enters the battlefield with an additional +1/+1 counter on it.
GU, Remove a +1/+1 counter from a creature you control: Draw a card.
Return all Zombie creature cards from your graveyard to the battlefield tapped, then destroy all Humans.