Destoroyah, Perfect Lifeform

Mutate [3][R] (If you cast this spell for its mutate cost, put it over/under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)

Flying

Whenever this creature mutates, create a red artifact token named Feather with "[1], Sacrifice Feather: Return target Phoenix card from your graveyard to the battlefield tapped."