[Endoperez]

I suggest that you find and read Baalz's Guide to Marverni. He describes various nasty ways to use Earth combination mages are, which would help you understand why Hidden Masters are so great. And they are great.

I think the Marverni guide has the highest combination of being fun to read and teaching new things about Dominions I've come across in these forums. It's not quite as fun as his guide to Hinnom( eats everything!), but it was the first time I was able to understand how much good mages rule in the endgame.