Costabile entered his professional career following a sensational 3+ years at Notre Dame. Prior to the shortened 2020 season, Costabile entered the year on the Tewaaraton Watch List and as a preseason First Team All-American. Costabile ended the 2019 season as the ACC Player of the Year, a First Team All-American, and a Tewaaraton Award nominee. He ranks ninth in Notre Dame program history for career goals (99) and 19th for career points (118). He was selected second overall in the 2020 PLL College Draft by Atlas LC. Costabile enjoyed a wildly successful rookie season at the 2020 PLL Championship Series where he picked up nine points and scored six goals.