I wrote about doing this exact thing awhile back. Great idea for a game!
I think I read that post with some excitement, good ideas often do not pop into just one head
We have been building this game for around 8 months now and are amazed by the development in bitcoin/color coin space. It looks like publishing the cards on top of the bitcoin blockchain will be a lot less hassle than initially expected. We are still a good while from completions but are hoping for at Beta Release of the game early 2016 and a wallet/marked place shortly after.