Returning to the Gophers for his junior year, Faber was named as team captain for the 2022–23 season. He recorded four goals and 27 points through 38 games, helping the Gophers reach the NCAA Championship game. Following an overtime defeat by Quinnipiac, Faber concluded his collegiate career.
On April 9, 2023, Faber was signed by the Minnesota Wild to a three-year, entry-level contract and immediately joined the roster of the playoff-bound Wild.[8]
Faber scored his first NHL goal on October 12, 2023, in a 2–0 victory over the Florida Panthers.[9] In January 2024, he led all rookies in points and assists, and was named Rookie of the Month.[10] He ultimately appeared in all 82 games for the Wild and recorded eight goals and 39 assists during the season. His 39 assists were tied with Connor Bedard for most assists among rookies, while his 47 points were tied with Luke Hughes for second most points among rookies. He led rookies in ice time per game (24:58) and blocked shots (150) and was first among rookie defenseman in shots on goal (136) and even-strength points (31), and second to Hughes in power-play points (16). He set single-season franchise records for assists, points, blocked shots, and time on ice by a rookie defenseman. His total time on ice, 2,047:53, was the highest single-season figure by a rookie since the statistic began being recorded in 1997–98. Following the season he was named a finalist for the Calder Memorial Trophy and named to the NHL All-Rookie Team.[11][12][13]
On July 29, 2024, the Wild signed Faber to an eight-year, $68 million contract extension.[14]