Marchesa's Tyranny

When Marchesa's Tyranny enters the battlefield, you become the monarch.
Whenever a creature attacks you, its controller loses 1 life. If you are the monarch, that player loses 2 life instead.
Whenever a creature attacks one of your opponents, that creature gets +1/+0 until end of turn. If the defending player is the monarch, that creature gets +2/+0 until end of turn instead.