Basically a system telling you (as the Admin) that users X, Y and Z have played 5 games in a very short amount of time, which would prompt you to look at the replays and, if said abuse was confirmed, banning their account (and IP adress) for a week or so with a warning, with repeated ofenses being punished by loss of cards, then loss of gold (I assume cards were bought with said gold, rather than just letting it sit there stacking, although both could be removed), then permaban of account, and, as a last resort, permaban of IP adress. Seriously, if someone tries to game the system with THIS MUCH warning (and gaming a system that has no use gaming, since it's entirely virtual with no value whatsoever, unlike Magic Online, where you can make real money, and tournaments count towards your general rating), they had it coming, I'd actually be up for any punishment, like going to their houses and punching them in the face. Repeatedly.