108.3

The owner of a card in the game is the player who started the game with it in their deck.If a card is brought into the game from outside the game rather than starting in a player's deck, its owner is the player who brought it into the game. If a card starts the game in the command zone, its owner is the player who put it into the command zone to start the game. Legal ownership of a card in the game is irrelevant to the game rules except for the rules for ante. (See rule 407.)

Brand. Even if you lend a deck to a friend and play a game with him and cast this spell, nothing happens.