There are only a few basic rules for deck registration:
2. You may have one registered side deck of 15 cards - no more and no less. You may swap out cards before and after each match (or duel). You may swap cards between your deck and side deck as long as your side deck contains exactly 15 cards when done.
If a duelist is found to have a deck slightly or radically different from the one registered with that includes cards not registered with their deck or side deck, that duelist must modify their deck until it exactly matches the deck registered with the judges. If the duelist is unable or refuses to do so, they will be suspended from all tournaments as long as their current deck and/or side deck does not exactly match the one they originally registered with.
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