Nausea

All creatures get -1/-1 until end of turn.

Shepherd of Rot

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

When Maggot Carrier enters, each player loses 1 life.

Menace (This creature can't be blocked except by two or more creatures.)

Return target creature card from your graveyard to your hand.

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

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

When Shambling Goblin dies, target creature an opponent controls gets -1/-1 until end of turn.

When Ghoulraiser enters, return a Zombie card at random from your graveyard to your hand.

As an additional cost to cast this spell, sacrifice a creature.
Destroy target creature.

Target player reveals their hand. You choose an artifact or creature card from it. That player discards that card.

When Festering Mummy dies, you may put a -1/-1 counter on target creature.

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