'''Structure Deck: Machina Mayhem''' is the sixteenth [[Structure Deck]] to be released into the [[TCG]]. It is the [[TCG]] version of [[Structure Deck 18: Machiners Command]]. It introduces the [[Machina]] [[Archetype]] for the first time to the [[TCG]].It focuses partially on [[Union Monsters]]. The only differences from Machiners Command is the removal of [[Formation Union]] and , [[Card Trader]] and [[Wave-Motion Cannon]], which were replaced by a second [[Armored Cybern]] and , [[Solidarity]] and a [[The Big Saturn]].