This could add a fairly original aspect to Toribash. I would definitely want to collect these, if this idea was implemented. Fully support this.

Maybe people would actually gain the card item in their inventory, but have it be untradeable. The only problem there, then, would be having something like the tourneybot duplicate the item and send it to the winner.

It would be cool to be able to purchase certain effects after reaching different belts/qi. I'm sort of imagining Tripstone as a holographic pokemon card.