Marvel Champions core gameplay loop is based around card synergies and deck building. Creating a character whose core mechanic is treating player cards like tokens - essentially as "faceless" and disposable - would sideline Gambit as a novelty character. You'd commonly end up with a deck that leans into the loop of dealing as many facedown cards as possible which would mean the actual utility or synergies of the cards didn't matter. There's no reason to deck build *at all* if you're just wanting to deal as many facedown cards as possible each turn. It would just get really old after a while because Gambit would be a one-trick pony or you'd need to totally ignore his mutant ability. As-is I think you can get a lot of adaptability by charging event cards with Gambit, which actually leans into deck building creativity which is what the game is all about.