Hollow Dogs

Whenever Hollow Dogs attacks, it gets +2/+0 until end of turn.

Nekrataal

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

Phyrexian Gargantua

When Phyrexian Gargantua enters, you draw two cards and you lose 2 life.

Dark Banishing

Destroy target nonblack creature. It can't be regenerated.

Swamp

Demon's Horn

Whenever a player casts a black spell, you may gain 1 life.

Gravedigger

When Gravedigger enters, you may return target creature card from your graveyard to your hand.

Contaminated Bond

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
Whenever enchanted creature attacks or blocks, its controller loses 3 life.

Foul Imp

Flying
When Foul Imp enters, you lose 2 life.

Raise Dead

Return target creature card from your graveyard to your hand.

Highway Robber

When Highway Robber enters, target opponent loses 2 life and you gain 2 life.

Consume Spirit

Spend only black mana on X.
Consume Spirit deals X damage to any target and you gain X life.

Tanglebloom

Nightmare

Whenever this creature attacks or blocks, each opponent exiles the top two cards of their library.

Underworld Dreams

Whenever an opponent draws a card, Underworld Dreams deals 1 damage to that player.

Unholy Strength

Enchant creature
Enchanted creature gets +2/+1.

Serpent Warrior

When Serpent Warrior enters, you lose 3 life.

Drudge Skeletons

{B}: Regenerate Drudge Skeletons. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Deathgazer

Whenever Deathgazer blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat.