Dumba earned a spot in the Wild lineup to start the 2013–14 season and made his NHL debut on October 5, 2013, against the Anaheim Ducks, becoming the first player of Filipino descent to play in the NHL. He scored his first NHL goal on October 12 against Dan Ellis of the Dallas Stars. He recorded only two points in 13 games by December and the Wild loaned Dumba to the Canadian junior team for the 2014 World Junior Ice Hockey Championships. While Dumba was with the national team, the Rebels traded his WHL rights to the Portland Winterhawks and the Wild assigned him to Portland upon his return from the World Junior Championship.