Chittering Harvester

Creature — Nightmare — {5}{B}

Mutate {4}{B} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Whenever this creature mutates, each opponent sacrifices a creature of their choice.

Rarity: uncommon

EDHREC rank: 9020