Tearripper Skullnash

Flying, ward {3}
Whenever you destroy a non-black creature, all creatures you control lose all effects and become
copies of this card, or you may destroy them as
long as they are non-black permanents.
{b}: Destroy all human creatures on the battlefield, if you destroyed three or more, your opponent loses 15 life, if your opponent counters this ability, you lose the game.