Nice concept, a king of Russian roulette that give you more power if you succeed. It could be even better with more rewarding spells, or more controls on the spell choice. It could also be nice to add the effects permanently (like speed), to "build" our character along the game, and make a bad spell less deathly.
I like to have simple rules and be able to start playing right from the start, understanding how to play and what I am doing.
Thank you for the game !