Guilt

Guilt deals damage to target player equal to the
number of creature cards in that player's
graveyard.
Whenever a card leaves an opponent's graveyard,
you may pay {2}{r}. If you do, return Guilt from
your graveyard to your hand.
Those I've loved and those I've slain harbour grudges
all the same. To the dead, we are only thought of as
the living.