I would propose: A baseball card is a stand-alone item on cardboard, featuring a baseball related image, in which that image is the primary component of the item, and can be effectively handled in stacks.
A magazine, book cover, or 6 foot tall life size stand-up of a baseball player are not cards. A poster is not a card. It need not be in the traditional rectangle shape that most are. A playing card, a Bond Bread, a postcard are all cards.
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