Xathrid, the Dark Scourge

Flying, haste
Sacrifice another creature: destroy target nonland permanent an opponent controls
Delirium - Xathrid, the Dark Scourge gets +2/+2 and has lifelink as long as there are four or more card types among the cards in your graveyard.
"How pathetic it is to think that you could have one day surpassed Grislebrand, Ormendahl."