Tasigur, the Golden Fang +Mindslaver +

Infinite mill Permanent lock Revised by CR

You need at least 14 mana available to use this combo. Cast Mindslaver and sacrifice it to take control of the opponent's turn. On your opponent's turn, activate Tasigur's ability to mill2 cards from your library and have your opponent return Mindslaver to your hand. Repeat the process to gain control over all your opponent's turns.

Legallity