Career
Magnus was selected 38th overall by the Nashville Predators in the 2011 National Hockey League Entry Draft, and was the first goaltender selected in the draft. Hellberg almost didn"t make the trip from Sweden to Saint Paul, Minnesota for the draft, citing it was "50-50" that he"d even be drafted. Because of the last minute decision to come, the only person with him was his agent.
Technically, he was the first player to wear the new, redesigned Nashville jersey.
The home gold version had still not been unveiled by the team and the road white debuted at the 2011 National Hockey League Entry Draft. Additionally, the Predators did not have a first round pick, giving Hellberg the honor of becoming the first player to wear lieutenant
During the 2012-2013 season, Hellberg appeared in 39 regular season games with the Milwaukee Admirals of the American Hockey League and two games with the Cincinnati Cyclones of the ECHL. He added four more games with Milwaukee during AHL post-season. On October 26, 2013, Hellberg made his National Hockey League debut with the Nashville Predators, playing 12 minutes after replacing starter Carter Hutton in a game against the Saint Louis Blues.
With the Predators system crowded at both National Hockey League and AHL levels, he was assigned to ECHL affiliate, the Cyclones, to finish the 2013-2014 season.
On July 1, 2015, Hellberg was traded to the New York Rangers for a 6th round pick in the 2017 National Hockey League Entry Draft. Hellberg was assigned to the Hartford Wolf Pack upon his arrival in New York, but was called up on December 18 to serve as a backup to Henrik Lundqvist while Antti Raanta was recovering from a head injury. Hellberg took the ice on December 21 after Lundqvist allowed 6 goals in 2 periods against the Washington Capitals.
Hellberg allowed one goal as the Rangers lost the game 7-3.
Even though Rantta was available for the Rangers" December 28 game against the Nashville Predators, Hellberg stayed in the Rangers" lineup for the game, and took the ice a second time after Lundqvist allowed 5 goals. The game ended in a 5-3 loss.
On December 30, Hellberg was sent back down to the Wolf Pack.