Nahiri Vengeant

+2: Nahiri Vengeant deals 3 damage to each opponent. Exile the top card of your library. Until end of turn, you may play that card.
-2: Nahiri Vengeant deals 4 damage to target creature or planeswalker.
-6: Each opponent sacrifices each non-land permanent they control, you gain life equal to the number of permanents sacrificed this way.