Magic Tournament Rules wrote: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.
Magic Tournament Rules wrote:3.8 Card Shuffling
Once the deck is randomized, it must be presented to an opponent.

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