Parcelbeast (Showcase)

Mutate [G][U] (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.)

[1], [Tap]: Look at the top card of your library. If it's a land card, you may put it onto the battlefield. If you don't put the card onto the battlefield, put it into your hand.