I'd be careful with this if I were you (if you play largeish stakes that is). I've made a fair amount of money in my lifetime off of replacement cards in the deck. I used to point them out when I'd notice them until floormen, dealers, and players started brushing me off for it. But I can spot marked cards fairly easily. Unless there is absolutely no difference whatsoever between the condition and color depth of the deck you have and the replacement card, an observant player can easily take advantage of it. I play a lot of O8, and Aces are super critical in that game. They're also the first cards to get marked by other players, and thus the most likely to be replaced. I would say more often than not, I find myself in a game where I know what at least one or two of the aces look like from the back. Not exaggerating either. It's a huge, huge advantage. Especially in O8.