what are the chances/odds of getting Ex's in the Ex Power Keepers set? see, i must have bought loads of them, i nearly have the full set, needing only 3 holos and a couple of rares and trainers. but, the main proportion of the cards i need are ex's, and i only have 2 (Claydol ex and Shiftry Ex). what are the chances of getting Ex's from boosters? and is it worth buying loads more boosters just for these or should i turn to buying the cards individually?