One of the plethora of card game-based cartoons that were in vogue during the 1990s.

It's still going strong. I work at a comic shop on Saturdays where they have tournaments for it. I see little bastards and CHUD-like adults pour ungodly amounts of money into it.

That and Heroclix, Magic, Warhammer, Heroscape, D&D, and all the other crap we have.