Scavenger Blades

Scavenger Blades gets +1/+0 for each creature card in your graveyard.
{b/g}{b/g}, Exile a creature card from your graveyard: Put a +1/+1 counter on Scavenger Blades and
you gain 2 life.
{2}{b/g}{b/g}, Exile a creature card from your graveyard: Destroy target creature.