Vorclaw, Maw of Mutation

Deathtouch

Mutate {4}{b}{g} (If you cast this spell for its mutate cost, put over or under target non-Human creature you own. They mutate into the creature on top plus all abilities under it)

Whenever this creature mutates, it deals damage equal to its power to up to X target creatures where
X is the number of times this creature has mutated.