The Mask, Chaos Incarnate

Indestructible, Haste

Whenever The Mask, Chaos Incarnate attacks a player and is not blocked, that player flips a coin. If they win the flip, untap The Mask, Chaos Incarnate and that player gains control of it. If the player loses the flip, they lose the game even if somehow they could not.

The Mask, Chaos Incarnate remains in play if it is under another player's control when it's owner loses the game.

"Somebody stop me"
The Mask