Andrey, The God Of Random

+2: Add one mana of any color. When you spend this mana to cast a spell flip a coin. If you won, copy that spell. You can choose new targets for copy
-3: Andrey, The God Of Random deals 1d10 damage to eash creature. If creature would die this turn, exile it instead
-10: Roll d20. If you got 15 or more, you win the game