62 x 89 card sleeves Elite - Small (Japanese) The sleeves are extremely durable Just Sleeves - Japanese Size

(2022-06-10) If your Commander deck has two commanders, you can include only cards whose own color identities are also found in your commanders' combined color identities

Banlist History Restriction changes recorded for Ninjitsu Art of Duplication

Master Duel since they allow players to summon multiple Monsters at once, making it much easier to perform other types of Special Summons such as Fusion, Synchro, or XYZ Summons

With a small number of cards, a ridiculously high novel level can be achieved using level lifter on two monsters of the same type with less than 1000 ATK/DEF, discarding a high-level monster (at best, level 12 like "Yubel the Ultimate Nightmare" for example) thus making them both level 12