I'll note that I tend to be much more 'traditional' with MA Agartha and take a very high Dominion and prioritize spreading Dominion.
Claymen are actually quite nice in your Dominion, as the bonus HP raises their Regeneration. I wasn't aware that the Marble Oracle could gain Leadership from Items... I'll have to use them now.
And, of course, if you take a Monolith, I believe it is affected by your Dominion. Given Teleportation, you can use the 'damage reflection' strategy with it quite nicely.