Ou Sen

Vigilance, Ward {1} Whenever this creature deals combat damage to a player, you become the monarch. Whenever a creature an opponent controls deals combat damage to you, each opponent creates a 1/1 black assassin creature token with “when this creature deals combat damage to a player, that player loses the game” and goad those creatures. Whenever a creature an opponent controls deals combat damage to a creature you control, that creature becomes goaded until the end of that player’s next turn.