Death Pits of Rath

Whenever a creature is dealt damage, destroy it. It can't be regenerated.

Fatal Blow

Destroy target creature that was dealt damage this turn. It can't be regenerated.

Cemetery Gate

Defender (This creature can't attack.)
Protection from black

Binding Agony

Enchant creature
Whenever enchanted creature is dealt damage, Binding Agony deals that much damage to that creature's controller.

Thrashing Wumpus

{B}: Thrashing Wumpus deals 1 damage to each creature and each player.

Dark Ritual

Swallowing Plague

Swallowing Plague deals X damage to target creature and you gain X life.

Ragged Veins

Flash
Enchant creature
Whenever enchanted creature is dealt damage, its controller loses that much life.

Crypt Rats

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

Blood Pet

Pestilence

At the beginning of the end step, if no creatures are on the battlefield, sacrifice Pestilence.
{B}: Pestilence deals 1 damage to each creature and each player.

Swamp

Urza's Armor

If a source would deal damage to you, prevent 1 of that damage.

Culling the Weak

As an additional cost to cast this spell, sacrifice a creature.
Add {B}{B}{B}{B}.

Fevered Convulsions

{2}{B}{B}: Put a -1/-1 counter on target creature.

Soul Burn

Spend only black and/or red mana on X.
Soul Burn deals X damage to any target. You gain life equal to the damage dealt, but not more than the amount of {B} spent on X, the player's life total before the damage was dealt, the planeswalker's loyalty before the damage was dealt, or the creature's toughness.

Wicked Akuba

{B}: Target player dealt damage by Wicked Akuba this turn loses 1 life.

Drain Life

Spend only black mana on X.
Drain Life deals X damage to any target. You gain life equal to the damage dealt, but not more life than the player's life total before the damage was dealt, the planeswalker's loyalty before the damage was dealt, or the creature's toughness.