Structure Deck: Machina Mayhem (1st Edition) Master Set Checklist
Released February 23, 2010
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Structure Deck: Machina Mayhem (1st Edition) Master Set
Structure Deck: Machina Mayhem (1st Edition) is a Yu-Gi-Oh! set released in February 2010. It has 37 cards in the base set, counting every variant. Not sure which one you're chasing? Read What Is a Master Set?

