To me, it seems te amount of work required to make this would exceed the amount of benefit for the game itself.
Since only a small proportion of the people playing are active on this forum, and an even smaller proportion are making cards, and then an even smaller proportion would take the time to truly test their card in every possible situation.
While it would be useful in it's way, I can't see any reason why it would take priority. The best chance of this happening would be a user created system of testing cards. So, if you are really into the idea, find other people who are as willing to put their time into this as you.
However, I imagine it would take a lot of work to not only recreate the game as such, but prepare for possible card ideas which can be very varied.