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The basic disruptions when going first are these four: "Knightmare Gryphon" - Prevents activation of Special Summoned monster effects "I:P Masquerena" and "World Chalice Guardragon Almarduke" - Non-targeting deck bounce "Mekk-Knight Crusadia Avramax" - A resistance monster that can even lead to a checkmate "World Legacy's Secret" - Negates and destroys anything If you pull it off, you usually win

These monsters rank among the strongest creatures in the entire game, capable of bringing fear into the hearts of every duelist

(or a Nordic ofc), and Geek Boy is a Level 3 Wind Psychic which makes it work with E-Tele and Taketomborg

if heads, your opponent gets a refund

Strong magnetic closure.

Starting with a mechanic idea, it felt straightforward to create some cards with the mechanic and/or that supported the mechanic, then add some generic cards like removal spells and simple creatures