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.

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 "Explosive Urchin", with a focus on using Level 3 monsters to Xyz Summon Rank 3 Xyz Monsters. 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 Cards such as "Mystical Space Typhoon" and "Skull Kraken".

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 Monsters, 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 "Number 32: Shark Drake", Shark's Deck became more focused around Level 4 Monster Cards and reducing the amount of Overlay Units required for Xyz Summons such as "Bubble Bringer" and "Xyz Remora". After obtaining "Number C32: Shark Drake Veiss" through Chaos Xyz Evolution", Shark also began to use more members of the "Shark" archetype.

Yu-Gi-Oh! ZEXAL II
Reginald continues to use an "Xyz" WATER Deck, which even more focus on the "Shark" Archetype and his "Number C". He also uses an array of new cards based on other aquatic fauna such as "Big Whale" and "Starfish".Reginald's Deck has also become more flexible in terms that he can now Xyz Summon Rank 5 Monster Cards in addition to his other Xyz Monsters.

Deck
Shark's manga Deck is similar to his anime Deck, but with an increased focus on Xyz Summoning using the effects of cards such as "Chain Summon" and "Bahamut Shark", which is his ace monster.

Collected Numbers
So far, Shark has obtained 2 "Numbers" card, disregarding "Number 17: Leviathan Dragon", which was absorbed by Astral.