

Per the " Maximum of 3 Rule", during Deck construction there can be at most 3 cards with the same name in a player's Main Deck, Extra Deck and Side Deck (combined). The Extra Deck has a maximum size of 15 cards (including all Fusion, Synchro, Xyz, and Link Monsters combined). During the game, it is placed face-down in the Extra Deck Zone, and a player can Special Summon Monsters included in there. The Extra Deck is separate from the Main Deck, and contains combinations of Fusion, Synchro, Xyz, and Link Monsters. The Extra Deck (Japanese: エクストラデッキ Ekusutora Dekki usually abbreviated EX ( エクストラ ) デッキ since Code of the Duelist), formerly known as the Fusion Deck ( 融 ( ゆう ) 合 ( ごう ) デッキ Yūgō Dekki), is a Deck where Fusion, Synchro, Xyz, and Link Monsters (as well as Pendulum Monsters that would otherwise have been sent from the field to the Graveyard) are stored during a Duel. Formerly: 融合牌組 Rónghé Páizǔ / Jung4 hap6 Paai4 zou2, then 特別牌組 Tèbié Páizǔ / Dak6 bit6 Paai4 zou2
