chase card
n.— «Some avid collectors purchase large numbers of card packs in an attempt to find one of the elusive inserts, they also have been referred to as “chase” cards.» —“Card collectors search for pieces of history” by Jeff Himler Blairsville Dispatch (Pa.) July 1, 2005. (source: Double-Tongued Dictionary)
Further reading
Twice a day the River Thames recedes, revealing a muddy shoreline. Hobbyists known as mudlarks stroll the surface searching for objects that have found their way into the river over the centuries, everything from ancient Roman jewelry to modern...
What if, instead of being an inanimate object, a dictionary were alive? That’s the idea behind a lavishly illustrated new children’s book called The Dictionary Story (Bookshop|Amazon) by Oliver Jeffers and Sam Winston. This is part of a...