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Dave Hornish61 Topps Dice Game, 67 Topps Giants Stand Ups, 68 Topps Disc would all be good candidates. The 68 Topps Plak (not the checklist which pops up on occasion) is not a card but is fiendishly difficult and the 63 Topps premium Mask is also a tough "Non-card." I'd go Dice Game as the rarest, likely only 2 exist.