Mammoth Acquire MacKenzie Weegar

3/5/26: The Mammoth have recalled defenseman Dmitry Simashev from their AHL affiliate, the Tucson Roadrunners. Armstrong told the media yesterday that he expects Weegar to be unavailable for 10 days at most as the team finalizes his visa, allowing him to work in the United States. With Weegar sidelined and Maatta off to Calgary, the Mammoth had a need for an additional defenseman – a need that has been filled by this recall.

Simashev, 21, was the No. 6 pick of the 2023 draft, and in in his first full season of professional hockey in North America. He’s split time between Utah and Tucson, scoring 28 points in 30 games at the AHL level, and one point in 24 games in the NHL.

9:00 p.m.: The trade has now been officially announced by both teams. Utah GM Bill Armstrong issued the following statement regarding the addition of Weegar:

MacKenzie is a high-end defenseman with the type of leadership and work ethic that we want in a top-four blueliner. Acquiring MacKenzie solidifies our back end as we continue to push towards the playoffs, and he will be a great addition to our team on and off the ice.

The terms of the deal were confirmed to be what had been previously reported. Utah acquired Weegar in exchange for Maatta, Castagna, and three 2026 second-round draft choices. (via Utah, via New York Rangers, via Ottawa) Flames GM Craig Conroy told the media that Calgary was on Maatta’s 10-team no-trade list, meaning both Weegar and Maatta needed to, and ultimately did, sign off on being traded.

7:00 p.m.: According to Sportsnet’s Elliotte Friedman, the Utah Mammoth and Calgary Flames are finalizing a trade for defenseman MacKenzie Weegar. Sportsnet’s Eric Francis reported that Weegar has agreed to waive his contractual protection against a trade in order to facilitate the move to Utah. The deal has not yet been officially confirmed.

According to Frank Seravalli, the Flames are acquiring veteran defenseman Olli Maatta, a prospect, and three second-round picks in exchange for Weegar. Francis reported that the prospect involved is Jonathan Castagna, a 20-year-old center currently playing college hockey at Cornell University.

The Mammoth entered deadline season coveting a right-handed shooting defenseman, and they have seemingly landed a top target. Not only is Weegar one of the better two-way defensemen in the league, but he’s arguably the best at being able to play on both sides of the blue line. That’s an added level of versatility that should complement the existing defenders in the lineup in Utah.

From Weegar’s perspective, the significant decision was likely about whether to commit what is likely to be the rest of his best playing years to the Mammoth. Utah (or previously the Coyotes) have made the playoffs once since 2011-12. Weegar is under contract for an additional five years beyond this one at a $6.25MM cap hit. When his contract expires, he will be 37 years old.

When deciding whether to commit to the Mammoth, Weegar undoubtedly had to consider whether he feels he’ll be able legitimately compete for a Stanley Cup championship. Utah are an ascending team, to be sure, but there is still a difference in near-term competitiveness between them and, say, the Tampa Bay Lightning or Colorado Avalanche.

The on-ice fit in Utah appears to be there, at least. The Mammoth boast several high-quality defensemen, but his best fit may be on their second pairing alongside John Marino, a spot currently occupied by 34-year-old Nate Schmidt. He could also play alongside Ian Cole, which would likely mean playing on the right side.

In any case, the Mammoth are adding a versatile, extremely reliable defenseman for their playoff push, and for several future playoff pushes.

Weegar has been an all-situations minutes-eater for the Flames this season, averaging 23:06 time-on-ice per game, including usage on both sides of special teams.

From the perspective of the Flames, they have added some useful future assets in this deal.

While the return for Weegar notably lacks a high-end young asset going the other way, adding three second-rounders (presumably the trio of second-round picks the Mammoth have for the 2026 draft) is still extremely valuable.

There are talented players to find in the second round every year, and odds are the Flames will have the chance to draft a few future NHLers with those picks. One of the draft picks originally belonged to the New York Rangers, and its one that is likely to be near the top of the second round of the draft order.

In addition to the picks, the Flames added Maatta, who is a useful veteran defenseman in his own right. He’s a player who needed a fresh start, having been a frequent healthy scratch, and he’s now gotten one in Calgary, where he’ll likely play heavy minutes. He’s averaged just 12:03 time on ice per game this season, way down from his career average of 18:16 per game.

Maatta is under contract for an additional two years at a $3.5MM cap hit, and if he can effectively weather the minutes he’s likely to receive as a Flame, he could be a candidate for the Flames to trade at some point down the line. If that ends up being the case, the Weegar trade could still yet add even more future assets to the Flames organization.

The final piece of the Flames’ return for Weegar is Castagna, who as mentioned is currently a top center for Cornell. The 2023 No. 70 overall pick has had a strong bounce-back year, and according to Scott Wheeler of The Athletic, is an “excellent athlete and skater.” Wheeler noted Castagna was set to slot in as the No. 12 prospect in Utah’s system in his upcoming prospect pool rankings. Francis reported that the Flames are “very excited” about adding Castagna.

While he’s not a high-pedigree prospect with a strong chance of changing the fortunes of the Flames franchise, his addition fits the strategy the Flames appear to have taken with this deal: they’re looking for as many chances as possible to get future long-term NHL contributors.

The Flames, as currently constructed, have quite a few roster needs, so it’s understandable that they would rather spread out their return and give themselves as many chances as possible to land a quality player, rather than shift all of their eggs in one basket in hopes of one target turning into a star.

Photos courtesy of USA Today Sports Images