Kha'Zix The Voidreaver

+2: Put a -1/-1 counter on target creature if that creature would die this turn you gain 3 life and draw a card.
-5: Destroy target artifact or enchantment with cmc 3 or greater, then you may return a card from your graveyard to the top of your library.
-11: Each opponent loses life equal to the number of creature in all graveyards you gain life equal to the life lost this way.