Need help making an Overworld elementalist deck

So far I have 2x Gronmor and a Tangath Toborn in Training on my team. Not sure what battlegears and creatures to pair them with though. I think I recall people using Brain Amplifier on Gronmors. I'd like to add a Heptadd and Najarin Fluidmorpher to the team if I could get my hands on them.

I like Citadel Fragments on either TTIT (tangath) or Gronmor. The energy is great and the stats just make it even better.