Sewer Spook

{2}{b}, Discard Sewer Spook: Target creature gets
-2/-2 until end of turn.
At the beginning of combat on your turn, if
Sewer Spook is in your graveyard, exile target creature card from an opponent's graveyard.
When you exile a creature card this way, its
owner loses X life, where X is 4 minus the exiled
card's toughness. Then, if that card had power
4 or more, exile Sewer Spook from your
graveyard.