Parcelbeast

Mutate {g}{u} (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.)
{1}, {t}: 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.