Dirayar, the Necrohunter

+2: Add a +1/+1 counter on a target enemy creature. Then, draw a card.
-1: Deal X damage to each opponent's Black creatures, where X is the total amount of +1/+1 counters on each opponent's creatures.
-6: Instantly destroy a target Black creature that has a +1/+1 counter. You gain health that is equal to the creature's combined power and toughness.