Everquill Phoenix (Showcase)

Mutate {3}{R} (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 “{1}, Sacrifice Feather: Return target Phoenix card from your graveyard to the battlefield tapped.”