Historical Rules · 16 July 2010
Rule 800.4a
Official source text from the 16 July 2010 Rules release
When a player leaves the game, all objects (see rule 109) owned by that player leave the game, all spells and abilities controlled by that player on the stack cease to exist, and any change-of-control effects which give that player control of any objects end. Then, if there are any objects still controlled by that player, those objects are exiled. This is not a state-based action. It happens as soon as the player leaves the game. If the player who left the game had priority at the time he or she left, priority passes to the next player in turn order who's still in the game. Example: Alex casts Control Magic, an Aura that reads, "You control enchanted creature," on Bianca's Wall of Wood. If Alex leaves the game, so does Control Magic, and Wall of Wood reverts to Bianca's control. If, instead, Bianca leaves the game, so does Wall of Wood, and Control Magic is put into Alex's graveyard. Example: Alex casts Threaten, which reads, in part, "Untap target creature and gain control of it until end of turn," targeting Bianca's Wall of Wood. If Alex leaves the game, Threaten's change-of-control effect ends and Wall of Wood reverts to Bianca's control. Example: Alex casts Bribery, which reads, "Search target opponent's library for a creature card and put that card onto the battlefield under your control. Then that player shuffles his or her library," targeting Bianca. Alex puts Wall of Wood onto the battlefield from Bianca's library. If Bianca leaves the game, Wall of Wood also leaves the game. If, instead, Alex leaves the game, Wall of Wood is exiled. Example: Alex controls Genesis Chamber, which reads, "Whenever a nontoken creature enters the battlefield, if Genesis Chamber is untapped, that creature's controller puts a 1/1 colorless Myr artifact creature token onto the battlefield." If Alex leaves the game, all such Myr tokens that entered the battlefield under Alex's control leave the game, and all such Myr tokens that entered the battlefield under any other player's control remain in the game.