Ob Nixilis Death Avenger

+1: Each opponent loses 1 life for each plainswalker he/she control. You gain that much life.
-4: All creatures you don't control gain -4/-4 until end of turn. If at least two creatures you control have died this turn, they gain -8/-8 instead.
-9: Each opponent sacrifices all nonland permanents he/she controls. They lose that much life and you gain that much life. Draw that many cards.