Mutate 2W (If you cast this spell for its mutate cost, put it over or unter target non-Human creature you own. They mutate into the creature on top plus all the abilities from under it.
Whenever this creature mutates, other creatures you control get +X/+X until end of turn, where X is the number of times this creature has mutated.
illus. Leesha Hannigan # 16/274