Copley was traded to the Blues along with forward Troy Brouwer and a 2016 third-round draft pick in exchange for forward T.J. Oshie, NHL.com reports. After finishing up his career at Michigan Tech last spring, the undrafted Copley saw his stock skyrocket last season at AHL Hershey in 2014-15. He posted an outstanding 2.17 GAA and a .925 save percentage in 26 games for Hershey, and will now give the Blues an intriguing developmental prospect at AHL Chicago. If he continues to excel in the minors this coming season, Copley could eventually usurp Jake Allen or Brian Elliott for one of the two goalie jobs in St. Louis.