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Like other Extra Deck monsters, Synchro Monsters cannot exist in the [[hand]] or [[Main Deck]] (even with card effects). If a Synchro Monster would be moved to the hand or Main Deck, it is returned to the Extra Deck instead. If a card like "[[Transmigration Break]]" or "[[Degenerate Circuit]]" is applying, this will override the Synchro Monster's ability to return to the Extra Deck.
Like other Extra Deck monsters, if a Synchro Monster is not Synchro Summoned first, it cannot be [[Special Summon]]ed from the [[Graveyard]] or while [[banish]]ed (unless an effect specifically mentions a certain monster, for example Shooting Quasar Dragon's effect of summoning Shooting Star Dragon). However, this is not treated as a synchro summon, therefore if Shooting Star Dragon banishes itself via its effect, it specifies another way cannot be brought back to properly Special Summon it)the field. Some effects treats a special summon as a synchro summon and thus, this weakness is bypassed. An example of this is Stardust Warrior.
==History==Similar to how Synchro Monsters replaced Ritual and Fusion Monsters when ''[[Yu-Gi-Oh! 5D's]]'' started, [[Xyz Monster]]s replaced Synchro Monsters when ''[[Yu-Gi-Oh! ZEXAL]]'' started.
However, whilst Synchro Monsters did not appear in the ZEXAL anime or manga, additional support for Synchro Monsters still appeared on occasion in the TCG although the primary focus of all ZEXAL-era products was Xyz Monsters. The TCG version of the booster packs ''[[Generation Force]]'', ''[[Order of Chaos]]'', ''[[Photon Shockwave]]'' and ''[[Cosmo Blazer]]'' all included 1-3 new Synchro Monsters despite primarily containing Xyz Monsters. Synchro Monsters also have been on occasion released in the ''[[2012 Collectors Tins]]'' as promo cards and new Synchros were still released in several Hidden Arsenal sets, ''[[Hidden Arsenal 5: Steelswarm Invasion]]'' and ''[[Hidden Arsenal 6: Omega Xyz]]''. The latest addition in ''[[Gold Series]]'', ''[[Gold Series: Haunted Mine]]'' contained reprinted Synchro Monsters as well. The ''[[Premium Collection Tin]]'' also included 3 new Synchro Monsters, and several Synchro Monsters were reprinted in the ''[[2013 Collectors Tins]]''. ''[[Judgment of the Light]]'', however, marked the first time since Xyz Monsters came into the game that Synchro Monsters gained much support and new monsters, featuring 8 new Synchros, about the same number released per set during the Yu-Gi-Oh! 5D's era of the TCG. One of the newest Structure Decks, ''[[Saga of Blue-Eyes White Dragon Structure Deck]]'' features a "[[Blue-Eyes White Dragon]]" Synchro Counterpart ("[[Azure-Eyes Silver Dragon]]"). ''[[Shadow Specters]]'' and ''[[Legacy of the Valiant]]'' released 4 and 3 Synchro Monsters respectively, including brand new, splashable and generic ones, such as "[[Giganticastle]]" and "[[Leo, the Keeper of the Sacred Tree]]", TCG-exclusives, like "[[Powered Inzektron]]", and Synchro monsters that only existed in the OCG, such as "[[Celestial Wolf Lord, Blue Sirius]]".
