Forge, Darksteel Scourge

Haste, Indestructible, Infect, Trample
At the beginning of your upkeep put a -1/-1
counter on each other creature.
Forge, Darksteel Scourge gets +1/+1 for each creature with a -1/-1 counter on it.
When a creature with a -1/-1 counter on it dies,
Forge, Darksteel Scourge deals 1 damage to that creatures controller.