Look at the games Triple Triad and Tetra Master from previous Final Fantasies and make a similar game - a competitive trading card game in essence.

1) If you kill any monster 10 times, you get a card for it to use in this game.
2) You can wager cards, gil, items, etc. on your card games.
3) It gives people a reason to farm/kill monsters that right now don't serve much of a purpose.
4) It also gives incentives to redo dungeons and kill bosses! Obviously boss cards would be the top tier of cards!
5) Add in a random card pack of 5 cards that you can buy with Philosophy Tomes (250 a pack)

Anyone else think this would be amazing? Any ideas are welcome. I would play this all the time if this was implemented!