Historical Rules · 1 May 2011
Rule 711.1
Official source text from the 1 May 2011 Rules release
Two cards (Mindslaver and Sorin Markov) allow a player to control another player during that player's next turn. This effect applies to the next turn that the affected player actually takes. The affected player is controlled during the entire turn; the effect doesn't end until the beginning of the next turn.