Recently, I built a deck that features the Machina, Magnet Warriors, Gadget, and Dinomist cards, and it came out very strong, having several different strategies for defeating opponents.
I thought I'd recreate this deck, except it is only the Machina side, featuring a filtered version of the Machina monsters. I've given this deck several different Union monsters in order to give your Machine-Type monsters some defense while you dig for the materials necessary to summon your Machina Force card.
If you have any suggestions or comments, be sure to let me know in the comments. :)