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However, later, they find Tetsuo has been forced to Duel a guy nicknamed Shark, and after being defeated, he takes Tetsuo's Deck

This is a powerful tool in any Exodia players arsenal, sabotaging your opponents most powerful Yu-Gi-Oh monsters from attacking

The deckbuilding requirement reminds me a lot of companions, specifically Lurrus of the Dream-Den, but without the degenerate part of starting in your opening hand

Several generic floodgates can incapacitate "Gishki": Anti-Special Summoning floodgates, such as "Archlord Kristya", "Evilswarm Ophion", "Fossil Dyna Pachycephalo", "Jowgen the Spiritualist" and the "Vanity's" cards can prevent the deck from summoning its Ritual Monsters

At a minimum, your result is one

Some of these characters appear to be from brand new, original worlds, all of which are strangely spider-themed