Well, I have seen people selling cards, but I'm not sure how they make the transaction. There is a good method for trading cards however. The game is identical to the real game, but there is no need to argue about interpretations of the cards. As it says in the info files "Each game is like having an official DCI judge sitting right at the table." So basically it will only allow you to make legal moves, another good thing is that it shuffles your deck and players can't "stack" their lands like they use to by shuffling in a land card every other card. Due to worldwide gambling laws, there are no ante games, but there are prizes you can win in tournaments.