One of the most impressive athletes in all of professional sports, Bo Jackson could do it all.  His All-Star game baseball card shown here is a testament to his greatness as he is the only athlete to be an all-star in both Major League Baseball and the National Football League.  As a baseball player, Bo Jackson took the field for nine seasons and clubbed more than 140 home runs.  He hit for three teams, but is most associated with the Kansas City Royals, as shown here in this 1990 Bowman card.  As a football player, Bo Jackson suited up for the Raiders as a running back after winning the Heisman Trophy in college.  As trading cards go, his baseball cards are more valuable, despite Bo arguably being a better football player.  Regardless, Bo Jackson will forever be known as one of the best athletes to ever play.