Sierena, Undertaker

Entomb - Whenever a creature card is exiled
from your graveyard by an effect you control,
gain life equal to the exiled creatures converted
mana cost.
{2}{w}{b/g}: Exile a creature card from your
graveyard. Put a +1/+1 counter onto Sierena, Undertaker and a +1/+1 counter onto another
target creature you control. Activate only once
per turn whenever you could cast a sorcery.