Rapacious Abomination

Mutate {p/r}{p/r}{p/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, Haste
When this Creature mutates, it gets +X/+0 until end of turn, where X is the number of Mountains you control.
Whenever this Creature is dealt damage, it deals damage equal to its power to any target.