Cemetery Prowler

Vigilance
Whenever Cemetery Prowler enters
the battlefield or attacks, exile a card
from a graveyard.
Spells you cast cost {1} less to cast for
each card type they share with cards
exiled with Cemetery Prowler.
"Ah, you're awake. I was hoping you'd
cry out in your sleep, then I would have
bitten your head off to silence you."