User blog comment:H1DD3NC0D3/Help me build a good team please?/@comment-26399146-20150629210320/@comment-26399146-20150705002924

Sry for taking a while to respond

The trick to beating mecha gods is simply to have perma mitigation every turn. You should be able to accomplish this by having a BB gauge fill on hit lead/buff (Oguro/Matah). Mecha Gods do a lot of aoe attacks, so getting at least BB every turn shouldn't be too hard. Bring a few fujin pots just to make sure though. Having at least one HP boost leads would also be very helpful. So I would advise

Oguro lead

Aaron

Selena

Yujeh(if doing Dark/Light mecha.  If not, leave her out)

Rigness (Even though the mecha god doesn't inflict status ailments, often times the round before the enemies will)

Tazer/Zelnite/Alpha if not using Yujeh (hard hitters)

I think at your point thought, you do have to worry about the cost amount. Assuming you have leveled a few levels this past week, you probably barely have enough cost for a full 6* team. 7* will be very cost heavy for you. But if you decide to 7* a few of your units, I would advise Ogurom, Aaron, or Feeva to be your best 7*.