Why not recycle the art? Only the game players saw it and many players gave up on the game before it finishes. And it's good art. I would be happy if they released a set of trading cards without the gameplay just of the art.

Meanwhile it's taken a long time for a TF CCG to really come along. I remember the fan games from like 20 years ago, one using playing cards as a base. I even have sketches of cards I was coming up with (along the lines of Magic and the SW CCG) back in the late 90s!