Skithiryx, the Dreadful

Flying, protection from white
Blight 4 (Whenever this creature attacks, you may distribute up to four -1/-1 counters among any number of creatures.)
Scrounge {5}{b}{b} (As an additional cost to scrounge,
sacrifice a creature. Then return this creature from
your graveyard to the battlefield. If it would die, exile
it instead. Use this ability only when you can cast a sorcery.)