You know, the card mechanic is really like TSR's SAGA system. They used it for Dragonlance and their Marvel RPG.
I love SAGA for supers. I wish they would have come out with a generic deck to be used with homebrewed settings, as i don't much care for Marvel. But i'll definitely be mining Marvel SAGA for ideas to include.
Aside: I didn't much care for SAGA for DL, but I would have adored it for Star Wars. In fact, when "Star Wars Saga Edition" was announced, I thought they meant "SAGA Edition" and damn near did a cartwheel..