on that same note if for example you have an effect that uses all the gaffed cards (not sure specifically but for arguments sake) and some other effect that only use half, or a few of them. depending on what effect you do more the wear rate of the cards will differ and when you try to combine them for the full deck effect the cards may appear different. When i used to do strolling i would keep the gaffs i used with their own decks so they would all wear the same. sometimes it was a bummer because it forced me to buy several of the same gaffs for different effects but I'm a stickler for consistency, theres nothing more obvious than a fresh deck with a worn gaff card.