[3] During the 2018–19 season, his freshman year, Stastney recorded one goal and three assists in 39 games for Notre Dame.

[4] He scored his first collegiate goal during the championship game of the 2019 Big Ten men's ice hockey tournament.

[11] During his rookie season, he recorded five goals and eight assists in 56 games for the Milwaukee Admirals of the American Hockey League (AHL).

Prior to being recalled, he recorded one goal and three assists in ten games for the Milwaukee Admirals.

[16][17] Stastney represented the United States at the 2018 IIHF World U18 Championships where he recorded one goal and four assists in seven games and won a silver medal.

[18] He represented the United States at the 2020 World Junior Ice Hockey Championships, where he was scoreless in five games.