Gul'dan, Fel Warlock

+1: Put a -1/-1 counter on up to one target creature.
-3: Gul'dan, Fel Warlock deals 2 damage to target opponent and destroy target creature that opponent controls.
-6: Sacrifice any number of creatures and create a 3/3 black Demon Lord with Flying, Indestructible, and two +1/+1 counters on it for each sacrifice.