I was lucky. My mom never threw any of my cards away, and I gave her plenty reason to. I'd usually have thousands of cards scattered throughout my room and would even build forts with them.
Needless to say they received plenty of wear. Unfortunately I grew up in the late 70's and 80's so no Mantle or Mays Rookies lying around. I do distinctly remember my favorite card being a dog eared 1972 Willie Mays I won in a game of flips. I loved those gaudy borders for some reason.
I was also the neighborhood knockdowns champion, responsible for winning the collections of an untold number of other kids. Later I blamed myself for the declining interest in baseball cards as I got older and it seemed like I was the only one collecting anymore.
I ended up either giving away or throwing away most of my cards myself in the 90's in the midst of many moves and being completely disgruntled with the hobby and modern cards............though I can almost guarantee I have a boxful of 82 Donruss and some HOOPS Basketball laying in a back storage room somewhere.