Purgers of the Abyss

+1: Create a 2/2 white Undead Ashen Knight creature token. Purgers of the Abyss deals 1 damage to any target and you gain 1 life.
-2: Exile target creature. If it wasn't black, its controller creates a 2/2 colorless Hollow token.
-7: Destroy all nonblack creatures, then exile all black creatures. Create a 2/2 white Undead Ashen Knight creature token. You get 3 soul counters.