The 2021 Topps Opening Day Relic Patch Wally The Green Monster #MR-WT Red Sox trading card is a collectible item featuring the mascot of the Boston Red Sox, Wally The Green Monster. Produced by Topps, this baseball card is part of the Major League (MLB) set for the 2021 season. With a green parallel/variety, this card is a sought-after piece for fans and collectors of sports trading cards, showcasing a unique and iconic design specific to the Boston Red Sox franchise.