Sara, Enlightened Unifier

Ward - Sacrifice a creature
All other ally creatures you control get +1/+2 and ward {2}
{w}{u}{b}{r}{g}: put and ally creature from your deck onto the battlefield tapped with 2 stun counters on it.
{p/w}{p/u}{p/b}{p/r}{p/g} Sacrifice 12 allies, win the game.

"Lift your heads up!! We've always done when we've had to do...! No matter how cruel it is, you can't stop!!" - Sara Chidouin