Yu Darvish and Bryce Harper, grab some bench. The honor of the hottest trading card this summer will belong to Michael Phelps. Topps recently released a series of 100 former Olympic greats and current hopefuls, but only one fan will have a complete set since only one Phelps “Golden Rainbow” card was produced. To make the card unique, the Phelps limited edition will be embedded with a slice of his (laundered) worn uniform. “Where else can you literally own a piece of Michael Phelps?” Topps marketing VP Mark Sapir asks. Sapir expects the value of the card to be in the hundreds, and that could soar if Phelps adds to his collection of gold medals this year. Let the hunt begin.