I think it would be cool. There would be guardian cards and the legendary ones would be the Vanguard, and The Exotic ones would be like Kabr and Jaren Ward. The guns would be cards too, they would have random stats (with some kind of boundaries) for each gun. It could be organized so you have a deck of say 30-60 cards, one being a guardian that you always start with, 2 more that could be in your fireteam. Exotic guardians would have their own weapons already equipped. The deck would also consist of about 15-30 weapon cards (half of your deck depending on deck size) and the rest of the cards could be abilities or something. I think it would work pretty well. Assuming it was guardian VS. Guardian. If you wanted a PvE kind of game you could have stories in books that would have the enemies and stories that you and a few other guardians could team up to play. It could be organized so you could go to a card gaming store and if you and your friends finish, the managers of the store would give you a set of reward cards. They are only given to each person once. Of course the cards are tradable but you can't get the reward cards again because they are only rewarded once per person, per store. The stores would keep a record book of the rewards too.