On August 5, 1976, the Los Angeles Lakers acquired 1977, 1978 and 1979 first-round picks, and a 1980 second-round pick from the New Orleans Jazz in exchange for a 1978 first-round pick and a 1977 second-round pick. This trade was arranged as compensation when the Jazz signed Gail Goodrich on July 19, 1976. The Lakers used the pick in 1979 to draft Magic Johnson.
Obvious answer but the Edmonton Oilers trading away Wayne Gretzky to the LA Kings is the answer for the NHL
As much as it is true, people do seem to forget they did win another stanley cup shortly after this in 1990. So that alleviates the burden a bit, knowing Gretzky didn't post Edmonton.
Cause they still had a Stanley cup roster, like Gretzky is the GOAT but he wasn't playing basketball where being the best player in the world is all a team needs to compete and win. The trade haunts them because they did it to dump salary sure they won another cup but imagine all the cups they should have at least competeted for if they still had Gretzky. When you make moves like that other players and people in the industry are gonna notice and not want to be part of something that doesn't have winning it all as the priority. Like ask oilers fans that cup in 90 ain't keeping them warm at all. And my reading comprehension may not be great but if im reading what you said correctly he did indeed lift Lord Stanley's cup again after Edmonton