i think if we were to implement something like this, then the card statuses would have to be dispellable. and obviously not every card would be able to be duplicated, i'd say just not let the MvP cards be allowed to be duplicated (not that i think anyone would want to duplicate for selling purposes), but i don't really see anything horribly broken about this, like kadar said. the buffs would only last 15 minutes, and you could only buff yourself with one card during that 15 minute duration, even if you were dispelled by a sage/prof/beholder if you're using them for pvm.
