Avacyn, the Veilborn

Flying, indestructible, deathtouch, lifelink
When Avacyn, the Veilborn, enters the battlefield, you may sacrifice a planeswalker.
If you do, each player sacrifices each non-Horror creature he or she controls. You gain life equal to the number of creatures sacrificed this way.
"With the power of the Chain Veil, and at the cost of Sorin's spark, Avacyn was once again."