In MOM I like how you can "multi-class" so-to-speak for your choice of magics, but it seems like I was focusing on just one every time. If I remember correctly, it was because multi-colored wizards wouldn't have access to higher-level spells. Ask yourself, if you were to compare a wizard of black & green (multi) to one that is pure black (or pure green): are they just different or does the mono-colored purist have a distinct advantage every time? All you would need to do is add multi-colored spells in to the game in addition to the mono-colored ones that we are used to. Thanks