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 (This creature can't be blocked except by creatures with flying or reach.), trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Whenever this creature mutates, exile cards from the top of your library until you exile a nonland permanent card. Put that card onto the battlefield or into your hand.