Reginald Kastle ' s Decks Reginald plays an Xyz WATER Deck consisting of monstrous looking sea creatures such as various races of sharks and arthropods . His nickname is " Shark " and is derived from his Deck theme and his previous brutal nature . Reginald acquired his Deck from his father at a young age . Anime . Ancient Deck . In his past life as Nash , ruler of the United Lands of the Poseidon Ocean , Reginald Dueled Vector in a Shadow Duel using stone tablet cards . Yu - Gi - Oh ! ZEXAL . Pre - World Duel Carnival . Shark utilizes a Burn strategy in order to gain an early advantage through cards such as " Submersible Carrier Aero Shark " and " Booming Urchin " , with a focus on Rank 3 Xyz Monster s . After losing to Yuma he modified his Deck to counter the " Numbers " by negating their effects with his ace monster " Black Ray Lancer " , as well as cards to take control of them . Reginald ' s Deck also sports a few cards that destroy Spell and Trap Card s such as " Skull Kraken " and " Mystical Space Typhoon " . World Duel Carnival Preliminaries . During the World Duel Carnival preliminaries , Shark continues to use similar strategies as he did previously , with a focus on Rank 3 Xyz Monster s , also adding Level manipulation cards like " Falling Current " and " Hammer Shark " . He also utilizes more cards focused on negation such as " Plate Salvage " and " Sea King ' s Verdict " . World Duel Carnival Finals . After acquiring " " , Shark ' s Deck became more focused around Level 4 Monster Cards and reducing the amount of Overlay Units required for Xyz Summon s , such as " Bubble Bringer " and " Xyz Remora " . After obtaining " " through Chaos Xyz Evolution , Shark also began to use more members of the " Shark " archetype . Yu - Gi - Oh ! ZEXAL II . Barian Invasion . Shark ' s Deck has become even more flexible in terms of his use of Xyz Summon ing , now ranging from Rank 3 to Rank 5 . In addition , he also uses a large quantity of cards to swarm monsters to Xyz Summon such as " Tri - Slice " , " Panther Shark " and " Eagle Shark " . His Deck also features a range of new " Shark " monsters as well as other aquatic fauna like " Big Whale " and " Starfish " . Shark also uses a number of cards to reduce the amount of Xyz Material required for his monsters such as " Double Fin Shark " , " Xyz Crown " and " Ghost Salvage " . Legendary Number War . Shark ' s Deck now focuses more on Rank 5 Xyz Summons , primarily his newly acquired " Number s " through cards such as " Edict of Atlantis " and " Depth Shark " . He also uses a multitude of cards to negate attacks such as " Hide and Shark " and " Deep Current " . Barian Emperor Onslaught . Upon regaining his identity and powers as a Barian Emperor , Nash continues to use the same Deck he used as a human , with the addition of his new " Over - Hundred Number " , " " , along with its . He also supplements his Deck with " Rank - Up - Magic " cards such as " Rank - Up - Magic - The Seventh One " , which lets him Rank - Up his " Over - Hundred Number " from the Graveyard , field or Extra Deck and " Rank - Up - Magic Quick Chaos " , a Quick - Play Spell Card which allowed him to instantly Rank - Up his " " into " " . Nash is also able to perform a " Chaos Draw " which allows him to create and draw cards that allow him to counter his opponent ' s strategy . After Don Thousand ' s defeat , Nash acquired the other six " Over - Hundred Numbers " and their " Chaos " versions . He used another variant of this Deck , which focused on swarming the field with those " Numbers " , using several support cards such as " Chaos Hundred Universe " , " The Greatest Duo of the Seven Emperors " and " Hundred Summon " to Summon them . The final goal of this is to Summon " CXyz Barian Hope " , a monster that can use the effects of all the " Chaos Over - Hundred Numbers " .