Yeah, well, I'm trying to get people to sign up to a game to test the spells I've added, but no takers

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The proof, as they say, would be in the pudding.
Druids are expensive - but they have a shot at *two* 4s (both earth and astral), and they are sacred. The problem is that it takes a while to get those magic types going.
EA Marverni's troops are inferior - but only slightly. I don't think that's really Marverni's problem.
Anyway, if you give Marverni spells that it can use to buff itself up early in the game, I think it becomes quite a bit more competitive.
EA Ulm is definitely stronger than MA Ulm. Having lousy MR on all of your troops is a lot less of an issue when you have a real horde of them; and your commanders (except for the dismal warrior chief whom you never use) all have decent MR. But I still think EA Ulm lacks a certain punch.
I've found LA Marignon to be a very strong position in multiplayer. I couldn't tell you why.