Court of Ambition is a rare Enchantment card from Commander Legends (CMR), collector number 645. Current market price: $10.45 (foil $12.31), TCGplayer market prices via Scryfall.
When this enchantment enters, 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.