I guess he could go, play using the same mechanic (i.e. rotating cards to give him an advantage) but deliberately make losing bets. Then reveal that because of

I guess he could go, play using the same mechanic (i.e. rotating cards to give him an advantage) but deliberately make losing bets. Then reveal that because of the rotations he could have won (I guess, show them that ke knew the card values and give an alternative series of winning bets he ought to have placed) therefore the game was unlawful, and demand his losses be returned. Quite why he would do that is anyone's guess - trolling the casino for the lulz because he has millions of dollars he can afford to lose?