[Dragar]

I think the strategy is fairly sound in terms of building a solid army of golems with earth support, but I'm concerned that the gems and research needed for any diversity will be very difficult to achieve..

It is difficult to build up a decent fire or water income and extremely difficult to gather much astral. Mechanical men are very useful in giving some elemental resistance but they are way down the research tree.

What does agartha do in the mid game against elemental evocations? Especially when on the attack without your dominion giving extra HP, I can imagine sitting in high dominion they might survive, but dom 7 will mean very little if any push past your boundaries, and you are definitely a target for dominion push, without the gold to fight back effectively. An enemy doesn't have to domkill you, just drop it enough for the golems to be weakened, then hit with area effect evocs.

How can it counter flying/stealth raiders?

It really does seem to be a one-trick pony without the path diversity to really change that. Yes having the forge lord makes things a lot cheaper, but when you start talking about equipping a heap of mages.. and to get an earth reader forging bloodstones how much blood do you have to gather using either your pretender or scouts?

I do like the destruction/iron bane with blade storm combo, that is very viable, as is earthquake. Magma eruptions yes. Anything requiring heavy fire/water/astral I don't think is highly feasible until very late game, if you survive that long.