Coyle, 33, has 22 points in 64 games this season (15G, 7A) with the Bruins.
He was drafted 28th overall by the San Jose Sharks in 2010 but was traded along with Devin Setoguchi for the blockbuster package that brought Brent Burns to California.
Spending seven seasons in Minnesota, he registered 242 points in 479 games (91G, 151A) and brought a solid two-way game to a Minnesota team that has never relied on a lot of flashiness in order to be successful.
He was then traded to Boston for Ryan Donato (another 2025 potential trade target) and has been there ever since. He's also spent seven years with the Bruins and registered 230 points in 452 games (96G, 134A) and was always a threat in the playoffs as well.
His ability to win face-offs, kill penalties, and resume give the Avalanche a big boost as they look to make a push in a very tough Central Division and grab a wildcard spot.
Mittelstadt, 26, is a former Top 10 pick with the Sabres in 2017 but never really reached the heights expected of him.
Enjoying a solid season in 2024-25, he has 34 points in 63 games (11G, 23A) and only has 230 points in 420 games with Buffalo and Colorado.
Zellers, 18, is Colorado's 76th overall pick in 2024 and has yet to play in the NHL, currently with Green Bay of the USHL; he has 58 points in 40 games (37G, 21A) with 40 PIM.