Though this question might sound weird but I've been asking myself lately whether there are gamblers who use magic tricks to predict gambling games being it casino, sport bets or slots and if someone has experimented it before and got results?
I don't believe in those things, and I don't think it's ever possible for someone to use some supernatural power to influence the outcome of a game.
The magic you refers to is what some people also call black magic; those are just things that are inside its believers. Sometimes coincidentally, the game result comes out the way they predict it, and they will claim that it's their power that influences the outcome of that game. If it were that possible, most casinos could have been put out of business a long time ago.