Based around cards from machina mayhem structure deck.They focus on the use of gadgets and other machine monsters to bring out
Machina Fortress or Machina Force.Machina decks also use the spell card Machina Armored Unit to replace their machines when they're
destroyed in battle.They also use powerful traps like mirror force to protect their gadgets due their weak attack and defense.I like to use
Machine King and 7 complete from the older series to boast my machines and I use the Machine King when a Machina Fortress ( with 2500
Attack) is destroyed and I summon it out with Machina Armory Unit.