Everquill Phoenix / Destoroyah, Perfect Lifeform (IKO-374) (Borderless)

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