In 55 games with the Sabres and Islanders this season, Moulson registered 17 goals and 38 assists for 38 points.
The native of Mississauga, Ontario, has accumulated 135 goals and 127 assists for 262 points in 377 career NHL games with Los Angeles, the Islanders and Buffalo.
McCormick, 30, has one goal, four assists and 45 penalty minutes in 29 games with Buffalo this season.
The native of London, Ontario, has notched 19 goals and 40 assists for 59 points and 503 penalty minutes in 358 career NHL games in nine seasons with Colorado and Buffalo. He was originally selected by Colorado in the fifth round (144th overall) of the 2001 NHL Entry Draft.
Mitchell, 29, notched five goals and 12 assists for 17 points in 103 games with Minnesota after being signed as a free agent on July 1, 2012.