Changes

The '''Extra Deck''' (Japanese: エクストラデッキ ''Ekusutora Dekki'', abbreviated {{Ruby|ＥＸ|エクストラ}}デッキ in [[card text]] since ''[[Code of the Duelist]]''), formerly known as the '''Fusion Deck''' ({{Ruby|融|ゆう}}{{Ruby|合|ごう}}デッキ ''Yūgō Dekki''), is a Deck where [[Fusion Monster|Fusion]], [[Synchro Monster|Synchro]], [[Xyz Monster|Xyz]], and [[Link Monster|Link Monsters]], s (as well as [[Pendulum Monster]]s that would otherwise have been sent from the [[field]] to the [[Graveyard]], ) are stored during a [[Duel]]. Any old card that still refers to the Fusion Deck applies to the Extra Deck.

The Extra Deck is separate from the [[Main Deck]] and is placed face-down in the [[Extra Deck Zone]]. Like the Main Deck, the number of cards in the Extra Deck is [[public knowledge]]. Unlike the Main Deck, its owner it the player can look through it their own Extra Deck at any time. The face-down contents of the Extra Deck are not public knowledge, so the opponent cannot look through face-down cards in the Extra Deck; however, the face-up cards in the Extra Deck are public knowledge, so either player may look through them at any time.<ref>{{cite book |author=Konami |title=Yu-Gi-Oh! Official Card Game - Perfect Rulebook 2015 |url=https://ygorganization.com/perfectrulebook/ |page=43}}</ref>It is not necessary to [[shuffle]] the Extra Deck, even when a card specifies that the card is shuffled into the Extra Deck.

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). During Deck construction, the Extra Deck has a maximum size of 15 cards (including all Fusion, Synchro, Xyz, and Link Monsters combined). However, Pendulum Monsters placed face-up in the Extra Deck during a Duel does not count towards this limit, and thus, can cause the total size of the Extra Deck to exceed the maximum size permitted during Deck construction.

If a Fusion Monster, Synchro Monster, Xyz Monster, or Link Monster would be [[return]]ed to the [[hand]] or [[Main Deck]], it is instead moved returned to the Extra Deck, (face-down), since Fusion Monsters, Synchro Monsters, Xyz Monsters, and Link Monsters cannot exist in either the hand or the Main Deck. It is not necessary to [[shuffle]] the Extra Deck, even when a card specifies that the card is shuffled into the Extra Deck.