Enraged Zombie

Whenever Enraged Zombie becomes blocked, you may pay {1}{b}. If you do, exile a card from your graveyard, and put a -1/-1 counter on the blocking creature.
When I summoned them, they came in hordes; tireless, and weakening everything they touched. In short, the perfect shock troops. I'll enjoy watching Beleren's death.
-Nicol-Bolas