Rivals was the first "two-player starter set". It featured fourth edition cards and was in the kind of gift box fourth and revised came in.
It featured Mathis and another female wizard teaching two people how to play...
It was fair for a first try, but I can't say too much.
If you could pick one up for $10 or less, do, and sell it to me! It's pretty damn rare, actually!
The rares it features are Clockwork Beast and Jamedae tome. Thus, it really isn't worth anything more than a history lesson.