Council of Commorragh

When Court of Ambition enters the battlefield, you become the monarch.
At the beginning of your upkeep, each opponent loses 3 life unless they discard a card. If you're the monarch, instead each opponent loses 6 life unless they discard two cards.

"Only the cruel survive the court’s gaze. The ambitious thrive by offering suffering that eclipses their own."
—Asdrubael Vect