This archtype of monsters came out in the first series. You may of seen the xyz machine monsters in the first Yu-gi-oh movie. Only recently they have got the upgrade with the ABC monsters. Now its one of the top ten used decks around the world.
A – assault core x3
B – buster drake x3
C – crush wyvern x3
Gold gadget x3
Silver gadget x3
Thunder king rai – oh
Union hangar x3
One day of peace
Shard of greed
Burial from a different dimension
Call of the haunted
Solemn strike x3
ABC – dragon buster x3
Elder enity Norden
Number 39: Utopia
Number S39: Utopia the lightening
Gear gigant x
Dark xyz revellion dragon
Number 101: Slient honor ark
Number 103: Ragnazero
Castel, the skyblaster musketeer
Main combo is to use the A B and C monsters with the spell field card Union hanger. Activating the field card lets you draw a light monster from your deck. Summon one of the machines and get a union monster equipped to it. Then more handy effects when they leave the field.
Now the ABC dragon buster requires all A B and C monsters in the graveyard. So getting them to the field with Gold gadget and Silver gadget is easy and let you summon a leve 4 xyz monsters.
Best monster cards in the deck are Machina fortress and Lightray Daedalus. One helps getting light monsters to the graveyard and the other can be summoned with 4 or more light monsters in the graveyard.
Your extra draw cards are Upstart Goblin, One day of peace, Shard of greed, terraforming and supply squad.
Your defensive cards are Solemn warning, Solemn strike, Dimmensional barrier and Vanitys emptiness.