Gemini monster Gemini monsters ( Japanese : デュアルモンスター " Dyuarumonsutā " " Dual Monster " ) are Effect Monster s with the ability " Gemini " . They have effects , but these effects must be " unlocked " by performing an additional Normal Summon on them while they are face - up on the field ; until then , they are treated as Normal Monsters on the field and in the Graveyard ( everywhere else they are treated as Effect Monsters ) . While a Gemini Monster is face - up on the field as a Normal Monster by its own effect , the player may declare a Normal Summon of it again so that it becomes an effect monster . This is treated the same as if the player were Normal Summoning a monster from their hand ( except the monster does not actually come from the hand ) . The monster is not treated as on the field during the Summon Negation Window , but any Equip Cards equipped to the monster remains equipped ( they will be sent to graveyard if its Summon is negated or it leaves the field during the Summon response window ) . Tributes are not required for Level 5 or higher monsters if activating their effects by Summoning them this way . The process of the second Normal Summon is unofficially called " Gemini Summon " ( or " Dual Summon " in OCG , not to be confused with " Double Summon " ) . Gemini monsters debuted in " Tactical Evolution " . So far , Gemini monsters have yet to make a proper appearance in the anime or manga . However , several members have made brief appearances in " Yu - Gi - Oh ! 5D ' s " , " Yu - Gi - Oh ! ZEXAL " and " Yu - Gi - Oh ! ARC - V " . " Phoenix Gearfried " is on the poster for the World Racing Grand Prix , " Gigaplant " appears in a flashback of Akiza Izinski ' s past and " Crusader of Endymion " has been seen played by random Duelist s in and . Multiple copies of " Ancient Gear Knight " are used by members of Duel Academy during their invasion of Heartland City in . Rin used " Lucky Pied Piper " in a flashback in . " Future Samurai " appeared in a flashback , used by No . 9 in . The " Chemicritter " archetype is heavily focused on , and almost completely composed of , Gemini monsters . Many of the " Red - Eyes " monsters introduced in Series 9 are Gemini monsters . Text . The most recent Gemini card text reads as follows : Playing style . Decks built entirely around Gemini monsters are almost all Aggro Decks with strong field control , some capacity for field - swarm ing , and quick Synchro . However , the main strength of this archetype is versatility . Gemini Decks can vary greatly in specialty and method of operation , so much so that ( unlike many archetypes ) any two examples could be almost entirely different outside of two or three monsters and traps . The major types of Gemini Decks are Field Control ( which tend to focus on destruction effects ) , Equip ( which focus on Equips and often lean towards Warrior Gemini monsters ) , and the most popular : " Gigavise " ( which focuses on abuse of the effect of " Gigaplant " effect to field - swarm Plant s or Geminis , sometimes going for the Gigaplant OTK ) . Some may include elements of all these types . Now , with the debut of Xyz Monster s , Decks that revolves on Level 4 or lower Gemini and non - Gemini monsters has good potential in conducting a quick Xyz Summon of Rank 4 or lower Xyz Monsters . Gemini monsters have seen an upswing recently in inclusion in anti - meta Decks , with the powerful beatsticks ( " Elemental Hero Neos Alius " and " Crusader of Endymion " ) splashing in with support from " Honest " and " Gemini Spark " . The Fusion Monster " Superalloy Beast Raptinus " causes them to gain their effects immediately , and can be fused from any two Gemini . " Elemental HERO Neos Alius " is an ideal Fusion Material Monster for the " Elemental HERO " fusions with non - specific fusion material based on the different Attributes . What makes it really impressive is the use of " Super Polymerization " , enabling not only discards ( which are beneficial to a Deck of this kind ) but the theft of certain monsters depending on attribute . They benefit greatly from the many support cards that allow Normal Monsters to be Summoned back from the Graveyard , like " Birthright " . Gemini monsters can play an important role in Decks based around Normal Monsters . A good example of this is " Cú Chulainn the Awakened " , seeing as he can use the ATK of a Normal Monster in the Graveyard . Further strategy . If your Gemini Deck consist of utilizing level 4 Gemini monsters , adding in " Gemini Spark ” would be extremely effective in dodging inevitable trap cards or removing any target on the field . What makes " Gemini Spark " effective is the ability to chain it to an opponent ' s card such as " Bottomless Trap Hole " , which not only saves your monster from being banished but also enabling you to draw 1 card . In addition , " Gemini Spark " also benefits Gemini monsters such as " Blazewing Butterfly " which depends on a Gemini in your Graveyard . In Gemini decks that focus on gaining the effect of “ Gemini ” monsters , running " Supervise " is a must . Combos with “ Supervise ” involve “ Evocator Chevalier ” which destroys any card your opponent controls and reviving a Normal Monster from your Graveyard . Since " Gemini " monsters are Normal Monsters while in your graveyard , adding " Swing of Memories " can be of great use . This card proves versatile with the addition of Xyz Monsters , one may summon a monster on the field then use " Swing of Memories " to revive a Gemini in the graveyard , which will then set - up for an easy Xyz Summon ( since most Geminis are level 4 ) , a Tribute Summon ( such as " Knight of the Red Lotus " ) or Synchro Summon if a tuner is available . " Knight of the Red Lotus " is another great addition for a Gemini deck . This card resurrects a Gemini monster from your graveyard every turn . Although this card is a tribute summon , you may special summon it if the requirements are met . Xyz Monsters such as “ Daigusto Emeral ” may also be of great assistance in reviving a Gemini from your Graveyard . Gemini decks that specialize in sending your Gemini monsters to the graveyard often would use cards such as Future fusion , " Foolish Burial " or Featherizer . " Future Fusion " will send two of your Gemini monsters to your Graveyard ( best to send " Gemini " monsters that require Tribute ) which will then allow you to Summon " Superalloy Beast Raptinus " in a few Standby Phases . " Featherizer " will send a " Gemini " from your Deck to your Graveyard and allowing you to draw 1 card after being destroyed by battle . Weaknesses . All Decks that deal with Gemini are extremely vulnerable to commonly played cards such as " Book of Moon " ( which can reset the effects of Gemini monsters ) and " Bottomless Trap Hole " ( which not only stops their Summon , but removes them from play ) . Another problem with pure Gemini Decks is speed . Even when built for field - swarming , Gemini Decks can have a hard time matching the speed of the most commonly played archetypes that specialize in it , such as " X - Saber s " , " Blackwing s " , and " Lightsworn s " . Other weaknesses include " Fortune Lady " Decks because of their Field Spell " Future Visions " , which prevents Gemini monsters from gaining their effects , and " Black Garden " , which would cut down the ATK down to a quarter before it would gain its effects . Also , Gemini monsters tend to rely more heavily on support cards than some archetypes , so Decks built around them more typically go over the forty card standard than others . Recommended cards . Gemini Toolbox . This deck is focused on having the most functionality and focuses on monster effects and fast Synchro or Xyz Summon . Key cards are " Gemini Soldier " , " Damage Condenser " , and " Reinforce Truth " , which help get many of the main engines of the deck on the field safely and fast . ( Most staples are omitted but expected . ) Phoenix Revival . This deck mainly concentrates on sending " Phoenix Gearfried " from either your hand or deck to the Graveyard , so that it can be Special Summoned .