Historical Rules · 27 March 2015
Rule 714.2
Official source text from the 27 March 2015 Rules release
All Magic cards involved in the game that was restarted when it ended, including phased-out permanents and nontraditional Magic cards, are involved in the new game, even if those cards were not originally involved in the restarted game. Ownership of cards in the new game doesn’t change, regardless of their location when the new game begins. Example: A player casts Living Wish, bringing a creature card into the game from outside the game. Then that game is restarted. The creature card will be part of that player’s library when the new game begins.