When Boston Bruins general manager Don Sweeney had a trade deadline firesale, little did many people know that he would be moving some key players out and to Atlantic Division rivals. Brad Marchand was sent to the Florida Pantehrs and Brandon Carlo was sent to the Toronto Maple Leafs. Let's not forget Linus Ullmark being traded to the Ottawa Senators last summer.
Marchand was seen as a rental for the Panthers who were looking to defend their Stanley Cup championship, bt he re-signed there and will likely finish his career there. Carlo, however, had some term remaining on his contract acquired by Toronto, which helped the return being sent to Boston.