There was already a discussion about this, and although i would love something like it to kill time, it is also a major system not to mention heathstone is a game based entirely around the cardgame
witcher 3 which is another huge game have gwent though, but for a team this small i think it would be hard.
Tell you what, why dont you think up a card game, think up all of the rules and make a fully functioning cardgame, that would help alot, and then we could make it in tabletop simulator and play that while we are bored, if you are truly that dedicated and manages to do it then its great and we can use it as a community based hobby, but it shouldnt be something they have to use a ton of time making up and implementing
this is their previous answer from another thread about games
So if you want it, you should make a game so epic that they have to put it into the game 