Modern Horizons

Trample {3}{G}: Conifer Wurm gets +X/+X until end of turn, where X is the number of snow permanents you control.

As long as you had another creature enter the battlefield under your control this turn, Bellowing Elk has trample and indestructible.

Haste Morbid — {T}: Vengeful Devil deals 1 damage to any target. Activate this ability only if a creature died this turn.

Changeling (This card is every creature type.) When Irregular Cohort enters the battlefield, create a 2/2 colorless Shapeshifter creature token wit...

As long as you've drawn two or more cards this turn, Spinehorn Minotaur has double strike.

At the beginning of your upkeep, Ravenous Giant deals 1 damage to you.

When Quakefoot Cyclops enters the battlefield, up to two target creatures can't block this turn. Cycling {1}{R} ({1}{R}, Discard this card: Draw a ...

{R}: You may put a planeswalker card from your hand onto the battlefield. Sacrifice it at the beginning of the next end step.

Changeling (This card is every creature type.)

This spell costs {1} less to cast for each land card in your graveyard. Flying, haste

This spell costs {2} less to cast if there is a land card in your graveyard. When Igneous Elemental enters the battlefield, you may have it deal 2 ...

Sliver creatures you control have "{T}, Discard a card: Draw a card."

When Goblin Matron enters the battlefield, you may search your library for a Goblin card, reveal that card, put it into your hand, then shuffle you...

Haste Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)

Sliver creatures you control get +2/+0.

Sacrifice another creature: Until end of turn, Bogardan Dragonheart becomes a Dragon with base power and toughness 4/4, flying, and haste.

When Alpine Guide enters the battlefield, you may search your library for a Mountain card, put that card onto the battlefield tapped, then shuffle ...

Whenever Warteye Witch or another creature you control dies, scry 1.

Changeling (This card is every creature type.) Deathtouch

Whenever Undead Augur or another Zombie you control dies, you draw a card and you lose 1 life.

Flying Exploit (When this creature enters the battlefield, you may sacrifice a creature.) Whenever another creature you control dies, put a +1/+1 c...

When Rank Officer enters the battlefield, you may discard a card. If you do, create a 2/2 black Zombie creature token. {1}{B}, {T}, Exile a creatur...

{X}: Crypt Rats deals X damage to each creature and each player. Spend only black mana on X.

Carrion Feeder can't block. Sacrifice a creature: Put a +1/+1 counter on Carrion Feeder.