Xantcha, Phyrexian Defector

Haste, Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
Sacrifice Xantcha, Phyrexian Defector: Until end of turn, target legendary creature gains "When this creature dies, return it to the battlefield tapped under its owner's control."
"I will free myself and this world from Phyrexia at any cost, even if it means my death."