I have all my Topps pre 1995 sets in binders and have tried to get all the variations listed by SCD for those sets. After 1994 the regular sets are all still in boxes, except for a run of all the Heritage sets
Post 1994 I have not done many variations, but the Gordon card was one exception because of the hobby publicity it got when Topps pulled it from the set. It was supposed to be card 297. I ended up with 3 versions of it. The cut out ( mine is only Becket 9
), the white blank version...no cut out but no image, just Royals at top and name/position on bottom, and one of the actual pulled cards with regular front and back( several made it into the hobby). The latter is in an SCG 88 holder