Revenant

Tomb Stone - When you lose the game you
become a creature token. A 6/6 Colorless Zombie with
indestructible and Infect. As a creature you decide which player controls you. During the end step, you can
change controllers. During the combat of your controller's turn, you can make yourself attack or not attack. If the player that controls you is being attacked you get to choose how you block. During the upkeep, you do not have to untap yourself. You may tap yourself at any time.