Reap the Massacre

Exile all creature cards from all graveyards. Gain life equal to the total converted mana cost of cards exiled this way.
"For the living know that they will die, but the dead know nothing, and they have no more reward, for the memory of them is forgotten. Their love and their hate and their envy have already perished, and forever they have no more share in all that is done under the sun."
--Ecclesiastes 9:5-6