Well one thing you can do is make your own campaign setting in Etheria. With the OP kits, there is a bit to go off of, and enough world lore on the main page to get you going.
I toyed around with a RPG that uses the mage wars cards and a vatican type spell system.
Using the new amazing pen and paper RPG systems that are out there- it would be VERY easy to make some Mage Wars based campaigns, but not only that, easy to implement systems for spells and mages.
Fate core and Savage worlds could support a mage wars RPG with very little work and big payoffs.