The Most Famous “Collateral Damage” Trade in Maple Leafs History
Every so often in Toronto Maple Leafs history, you come across a story that isn’t really about a trade at all. It’s about what happens when a team starts fighting itself. And in that sense, the departure of Lanny McDonald might be one of the clearest examples of organizational self-inflicted damage the franchise has ever seen.
On the surface, McDonald is remembered as a Hall of Fame winger, a Calgary Flames icon, and, of course, the famous mustache. But before all of that, he was a Toronto Maple Leaf. More than that, he looked like part of the future.
McDonald was drafted fourth overall by the Maple Leafs in 1973.
Drafted fourth overall in 1973, McDonald quickly became exactly what the Maple Leafs thought they were getting. He was a powerful goal scorer with a heavy shot and a knack for showing up in big moments. By the mid-1970s, he had developed real chemistry with Darryl Sittler, forming one of the most dangerous duos in the NHL. When everything clicked, McDonald wasn’t just scoring—he was finishing plays that looked like they were built years in advance.
For a brief moment, it looked like Toronto had something stable to build around. Then the team began to fracture from within.
The well-known power struggle between Darryl Sittler and head coach Punch Imlach turned into something much bigger than hockey systems or ice time. It became about control of the dressing room itself. And when that happens in the NHL, it’s rarely the stars who suffer first—it’s the players around them.
McDonald was not a part of the conflict, but he sure was part of the collateral damage.
McDonald was not the target of the conflict, but he became part of its fallout. Because Sittler had a no-trade clause, Imlach reportedly shifted his attention to moving players around him instead. That included McDonald, his linemate and close teammate.
In December 1979, McDonald was dealt to the Colorado Rockies. On paper, it was just another transaction in a turbulent era. In reality, it was the moment the Maple Leafs effectively dismantled one of their most promising offensive cores.
What makes it sting even more in hindsight is what came next. McDonald didn’t fade away. He didn’t plateau. He went on to score 500 goals in his career, became a consistent 40-goal scorer for years, and eventually helped lead the Calgary Flames to their first Stanley Cup.
Looking back, the Maple Leafs might have cost themselves a Stanley Cup.
So when you look back at it now, the trade isn’t really about Colorado or Calgary. It’s about Toronto. Because this wasn’t a case of the Maple Leafs misjudging a player. It was a case of the team losing control of the environment. It likely cost the Maple Leafs big time.
And in that sense, Lanny McDonald might be the most famous piece of collateral damage in Maple Leafs history.