Deck Zone (デッキゾーン Dekki Zōn) is the place for player to put their deck. Deck Zone a hidden zone, and both players cannot look at or change the order of its contents unless a card effect allow a player to do so.
304 Deck Zone
304.1 Zone to put the deck prepared by player.
304.2 Deck Zone is a hidden zone. You can't change the order of cards put in the Deck Zone.
304.3 If you move several amount of cards from a specific position of the Deck Zone into another zone simultaneously, move a card from that position repeatedly for that specific amount of times.
304.4 When there is an instruction to move several amount of cards from the Deck Zone into another zone, if "up to ~" is written in the amount, perform one of the following actions.
304.4a Don't move the card.
304.4b Move a card. This action can be repeated as many times as the number indicated in "up to~" (you can also stop halfway).