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A quick look at the pieces coming back in the MacKenzie Weegar trade
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Photo credit: Eric Canha-Imagn Images
Ryley Delaney
Mar 4, 2026, 22:15 ESTUpdated: Mar 4, 2026, 21:30 EST
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The Calgary Flames’ second major trade ahead of the 2026 trade deadline has occurred.
On Wednesday evening, less than two days before Mar. 6th’s trade deadline, it was reported by Sportsnet’s Elliotte Friedman that the Flames were closing in on a deal with the Utah Mammoth for MacKenzie Weegar.
After a few hours of speculation about whether Weegar would waive his no-move clause and what and who the Flames would get back, the trade was made official. For Weegar, the Flames received Olli Määttä, three second-round picks in 2026, and prospect Jonathan Castagna. In this article, we’ll look at Määttä, Castagna, and where the three second-rounders could land.
Starting with Määttä, the 31-year-old left-shot defenceman was selected 22nd overall by the Pittsburgh Penguins in 2012. He won back-to-back J. Ross Robertson Cups with the London Knights in 2011-12 and 2012-13, then won back-to-back Stanley Cups with the Penguins in 2015-16 and 2016-17.
Since his departure, Määttä has played with the Chicago Blackhawks (2019-20), the Los Angeles Kings (2020-21 and 2021-22), and the Detroit Red Wings from 2022-23 until he was traded early in the 2024-25 season to the Mammoth. His career-best season came in his rookie campaign, where he scored nine goals and 29 points in 78 games, matching those 29 points during the 2017-18 season.
Castagna, who is from Toronto, Ontario, played his pre-NCAA hockey with St. Andrew’s College, and was teammates with fellow draftees Jack Pridham, Francesco Dell’Elce, and the most notable, Dean Letourneau. Aside from a game with the Toronto Jr. Canadiens of the Ontario Junior Hockey League, Castagna didn’t play junior hockey.
Still, he scored 29 goals and 72 points in high school action, then another six goals and 18 points in 13 Prep Hockey Conference games. That led to the Arizona Coyotes selecting him in the third-round of the 2023 draft. Castagna has played the last three seasons with Cornell University in the ECAC Hockey Conference.
In 2023-24, he scored 11 goals and 25 points in 35 games, but regressed in 2024-25, potting just five goals and 15 points. Through 29 games this season, the left-shot centre who stands at 6’2” had 14 goals and 32 points in 29 games.
As for the picks, the Flames acquired the New York Rangers’ second-rounder, the Ottawa Senators’ second-rounder, and the Mammoth’s second-rounder. On top of their own second-rounder, the Flames will get two picks in the 30-40 range, while both the Senators and Mammoth are jockeying for playoff position.
Add in owning their own and the Vegas Golden Knights’ first round pick, as well as their own and the Vancouver Canucks’ third-round pick, and the Flames are going to have at least eight picks before the 70th overall pick, potentially more depending on if they trade Nazem Kadri and Blake Coleman.
Ryley Delaney is a Nation Network writer for FlamesNation, Oilersnation, and Blue Jays Nation. She can be followed on Twitter @Ryley__Delaney.
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