Se decidi di mescolare il mazzo del tuo avversario, devi mischiarlo "correttamente" secondo il regolamento.
Non è mai considerato un mescolamento corretto il fare solo pile-shuffling in quanto questo metodo non aumenta la casualità (o caoticità) del mazzo (es. posso portare il mazzo alla configurazione di partenza o ad un'altra configurazione voluta conoscendo quella di partenza).
Magic Tournament Rules ha scritto:
3.8 Card Shuffling
Decks must be randomized using some form of riffle and/or mash shuffle at the start of every game and whenever an instruction requires it. Randomization is defined as bringing the deck to a state where no player can have any information regarding the order or position of cards in any portion of the deck. Pile shuffling alone is not sufficiently random.
Once the deck is randomized, it must be presented to an opponent. By this action, players state that their decks are legal and randomized. The opponent may then shuffle it additionally. Cards and sleeves must not be in danger of being damaged during this process. If the opponent does not believe the player made a reasonable effort to randomize his or her deck, the opponent must notify a judge. Players may request to have a judge shuffle their cards rather than the opponent; this request will be honored only at a judge’s discretion.
If a player has had the opportunity to see any of the card faces of the deck being shuffled, the deck is considered ordered and must be shuffled again.
At Competitive and Professional REL tournaments, players must always shuffle their opponents’ decks. The Head Judge can require this at Regular REL tournaments as well.
