Celaena Sardothien, Champion

Menace

Assassin spells you cast have freerunning {b}{b}.
(You may cast a spell for its freerunning cost if you dealt combat damage to a player this turn with an Assassin or commander.)

Whenever Celaena deals combat damage to a player, you may pay {w}{u}{b}{r}{g} if that player has
10 or less life. When you do, that player loses the game.