I had this idea a while back. Look on page three, about halfway down, and I go in depth on how these cards would potentially work (you'll see two large pictures).https://www.warlight.net/Forum/227079-warlight-2017?Offset=60
I've said it a million times before, and I'll say it again. I would kill a man if it meant we got nuke cards. That, and in-game currency for purchasing land and armies.