Much like the 1979 and 1980 Topps sets that followed it, the 1978 Topps set is primarily known for a single, quintessential rookie card. In 1979, it was Ozzie Smith. In 1980, it was Rickey Henderson.
Take me out to the ballgame, where Topps cards are being sold. Buy me some Mickeys and Jackies, too. I don't care 'bout what you have to do! Let me root, root, root for the rarest. If they don't sell, ...