Cassian, the Messenger

Menace Rebel creatures you cast have radicalized {B}{B}. (You may cast a spell for its radicalized cost if you dealt combat damage to a player this turn with a Rebel or commander.) Whenever Cassian 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.{/color#ffffff}