Ancient Chaos

Creatures you control get +1/+0 for each card in target player's graveyard and creatures that player controls get -1/-0 for each card in your graveyard.
Flashback {6}{u}{b} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
"Your sin was not that you said you agreed, your sin was that you spoke at all."
- Mandrose to Trovalia, crescent VI