Chittering Harvester
From Ikoria: Lair of Behemoths set
Chittering Harvester
Creature — Nightmare
4/6
Mutate
(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.