Eithné, Queen of the Dryads

Eithné, Queen of the Dryads gets +1/+1 for
each creature card in your graveyard.
{1}{b}{g}, Sacrifice another creature: Each opponent loses life equal to the sacrificed creature's power.
Sacrifice a non-Dryad creature: Return a
Dryad creature from your graveyard to your
hand.