Tar Pit Warrior

Nekrataal

Creature — Human Assassin (2/1)

First strike
When Nekrataal enters the battlefield, destroy target nonartifact, nonblack creature. That creature can't be regenerated.

Urborg Mindsucker

Creature — Horror (2/2)

, Sacrifice Urborg Mindsucker: Target opponent discards a card at random. Activate only as a sorcery.

Brood of Cockroaches

Creature — Insect (1/1)

When Brood of Cockroaches is put into your graveyard from the battlefield, at the beginning of the next end step, you lose 1 life and return Brood of Cockroaches to your hand.

Fallen Askari

Creature — Human Knight (2/2)

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
Fallen Askari can't block.

Suq'Ata Assassin

Creature — Human Assassin (1/1)

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
Whenever Suq'Ata Assassin attacks and isn't blocked, defending player gets a poison counter. (A player with ten or more poison counters loses the game.)

Wake of Vultures

Creature — Bird (3/1)

Flying
, Sacrifice a creature: Regenerate Wake of Vultures.

Crypt Rats

Creature — Rat (1/1)

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

Python

Creature — Snake (3/2)

Army Ants

Creature — Insect (1/1)

, Sacrifice a land: Destroy target land.

Mundungu

Creature — Human Wizard (1/1)

: Counter target spell unless its controller pays and 1 life.

Ovinomancer

Creature — Human Wizard (0/1)

When Ovinomancer enters the battlefield, sacrifice it unless you return three basic lands you control to their owner's hand.
, Return Ovinomancer to its owner's hand: Destroy target creature. It can't be regenerated. That creature's controller creates a 0/1 green Sheep creature token.

Bull Elephant

Creature — Elephant (4/4)

When Bull Elephant enters the battlefield, sacrifice it unless you return two Forests you control to their owner's hand.

Brass-Talon Chimera

Artifact Creature — Chimera (2/2)

First strike
Sacrifice Brass-Talon Chimera: Put a +2/+2 counter on target Chimera creature. It gains first strike. (This effect lasts indefinitely.)

Daraja Griffin

Creature — Griffin (2/2)

Flying
Sacrifice Daraja Griffin: Destroy target black creature.

Dwarven Vigilantes

Creature — Dwarf (2/2)

Whenever Dwarven Vigilantes attacks and isn't blocked, you may have it deal damage equal to its power to target creature. If you do, Dwarven Vigilantes assigns no combat damage this turn.

Iron-Heart Chimera

Artifact Creature — Chimera (2/2)

Vigilance
Sacrifice Iron-Heart Chimera: Put a +2/+2 counter on target Chimera creature. It gains vigilance. (This effect lasts indefinitely.)

Knight of the Mists

Creature — Human Knight (2/2)

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
When Knight of the Mists enters the battlefield, you may pay . If you don't, destroy target Knight and it can't be regenerated.

Lead-Belly Chimera

Artifact Creature — Chimera (2/2)

Trample
Sacrifice Lead-Belly Chimera: Put a +2/+2 counter on target Chimera creature. It gains trample. (This effect lasts indefinitely.)

Man-o'-War

Creature — Jellyfish (2/2)

When Man-o'-War enters the battlefield, return target creature to its owner's hand.

Pygmy Hippo

Creature — Hippo (2/2)

Whenever Pygmy Hippo attacks and isn't blocked, you may have defending player activate a mana ability of each land they control and lose all unspent mana. If you do, Pygmy Hippo assigns no combat damage this turn and at the beginning of your next main phase this turn, you add an amount of equal to the amount of mana that player lost this way.