A group that includes "Shark Tank" star Kevin O'Leary recently purchased the "holy grail of basketball collectibles," a one-of-one basketball card signed by Michael Jordan and Kobe Bryant, according to ESPN. The card is formally known as the Upper Deck 2007-08 Upper Deck Exquisite Collection Dual Logoman Autographs Jordan & Bryant card. Its $12.93 million final price broke the previous record of $12.6 million for a 1952 Topps Mickey Mantle card. According to ESPN, the Jordan/Bryant card is not only the most expensive sports card ever sold, but it's also the second most expensive piece of sport...