First, it should be noted that there are actually 108 different players depicted in this set, so the "100 Subjects" adv. on the E90-1 backs approximates the original intent.We have been debating levels of scarcity.......but, there are also cards in this set which appear to be quite available and were issued in a 1st Series (consisting of 50-60 cards);here are two major ones......AND, SOMEWHAT TOUGHER......probably issued in a 2nd Series (30-40 cards).AND, VERY TOUGH.....issued in the last Series (20-30 cards)