Football cards and stickers issued around the world, from the 1880's through to those that haven't even been issued yet. Some are rare, some very rare though many are easy to find. Alan Jenkins (firstname.lastname@example.org).
Rangers have issued another set of scratch cards this season, though I only know of two of them - 13 more to discover. UPDATE (15-04-2018 09:32): Thanks to Lindsay for identifying three more cards. 1976/77 1977/78 1996/97 1997/98 2003/04