YGO Structure Deck: Mechanized Madness - Rules of Play says:
Originally featured in the Machina Mayhem Structure Deck, Machina Gearframe and Machina Fortress ran rampant after their initial debut. Now, over a decade later, they are back and stronger than ever with a new wave of support to add to the Machina arsenal!
Structure Deck: Mechanized Madness is ready-to-play right out of the box, but you can add some extra firepower to your Deck with the help of other products like Duel Overload and more!