Shepherd of Rot

{T}: Each player loses 1 life for each Zombie on the battlefield.

Carnophage

At the beginning of your upkeep, tap Carnophage unless you pay 1 life.

Putrid Imp

Discard a card: Putrid Imp gains flying until end of turn.
Threshold — As long as seven or more cards are in your graveyard, Putrid Imp gets +1/+1 and can't block.

Gempalm Polluter

Cycling {B}{B} ({B}{B}, Discard this card: Draw a card.)
When you cycle Gempalm Polluter, you may have target player lose life equal to the number of Zombies on the battlefield.

Diabolic Edict

Festering Goblin

When Festering Goblin dies, target creature gets -1/-1 until end of turn.

Vendetta

Destroy target nonblack creature. It can't be regenerated. You lose life equal to that creature's toughness.

Carrion Feeder

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

Swamp

Dark Ritual

Vengeful Dead

Whenever Vengeful Dead or another Zombie dies, each opponent loses 1 life.

Chainer's Edict

Target player sacrifices a creature.
Flashback {5}{B}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)