Starlock
Magic dosen't fall under the 'can't be controlled' category, though.
I would be inclined to agree with Fiddler on this. Depending on what sort of game you're playing, what skills you're using and who you're playing with, magic could be a possibility. Playing cards with my pagan friends it's fine. Playing gin with my mother I wouldn't use magic because I want to see if I can beat her at her own game on her level. Then I'm even more proud of myself if I succeed.
If I were playing to win all the time I would probably use magic all the time. But that isn't the case. Sometimes you can learn a lot more by losing.