2009-10: Nystrom moved up to the MODO club in Sweden's top division after playing his youth hockey for Nacka HK. He spent most of the season with the U18 team and appeared in four SuperElit U20 games. In four games with MODO U20 he had 2 assists and was plus-two. Skating for the MODO U18 team, which finished fifth in Allsvenskan U20 North play, Nystrom scored 24 goals with 33 assists and was plus-44 with 6 penalty minutes. Nystrom appeared in just one of MODO's five playoff games and had no points or penalty minutes.
2010-11: Nystrom spent most of the season with the MODO U20 team – skating in 39 games – and also played for the club's U18 team. He scored 6 goals with 13 assists and was plus-one with 8 penalty minutes as MODO U20 finished seventh in the SuperElit league. In six playoff games Nystrom scored 2 goals with 1 assist and was plus-two. MODO defeated Linkopings before falling to Djurgardens in the quarterfinals. In 17 games with MODO U18 (including three playoff games) he scored 10 goals with 21 assists and had 2 penalty minutes.
2011-12: Nystrom made his Elitserien debut, skating in 19 games for MODO as an 18-year-old, and was one of the top forwards for the club's U20 team. Nystrom saw limited ice time with MODO, averaging less than three minutes of ice time per game, and had 2 assists while finishing minus-one. In 32 games for MODO U20, which finished sixth, he scored 9 goals with 19 assists and was minus-one. MODO reached the SuperElit U20 semifinals and Nystrom was the leading scorer in the playoffs; scoring 5 goals with 4 assists and finishing plus-four in eight games. He played seven international games for Sweden's U19 team. scoring 2 goals with 6 assists and was plus-two with 2 penalty minutes. Nystrom was ranked 85th amongst European skaters by Central Scouting prior to the 2012 NHL Draft and was selected by Montreal in the sixth round (154th overall).
Nyström has very good hockey sense, a good work ethic, can make things happen with his speed and excellent distribution skills. The smooth skating winger will need to add muscle mass and strength to play on the boards against the men while working on his shooting skills and improving his defensive game.
Nyström is under contract for another year with MODO in the SEL and could have the opportunity to help Team Sweden defend the Gold Medal at the 2013 World Junior Championship.