Ok, um, I'm awfully tired, so I'm just gonna layout a basic outline
Basically, peeps have been talking about a card game ingame. If devs don't offer one, then the problem is creating randomness, rules, and prevent cheating. So I suggest this. Two players (or more) meet in an area with a Referee. The Referee will hand 16 bag to player 1. player 1 gives the bags to player two. player two gives back to the ref. What is the purpose of this you ask? Because if you can hold all 16 new bags, that means you have absolutely nothing in inventory which reduces cheating.
Next, the ref hand 16 unexamined piggy plops to each player. The players then examine all of them and now have a variety of seeds. Guess what these seeds are? They are the player's hands!!!! Each type of seed will have certain attributes that you can now play with. Does this make sense so far? Now, the two players(or more) use their 'hands' to play a game.
Im no longer familiar with how card games like pokemon and magic and etc work, plus I'm too tired to be thinking about what each type of card (seed) could represent and how the mechanics of the game would work, which is why I posted here and was hoping that the community could come up with ideas.
Please let me know what you think.