The Minnesota Twins selected Faucher in the 10th round of the 2017 MLB draft with the 286th pick.[6] Faucher made his professional debut with the rookie-level Elizabethton Twins. In 2018, Faucher split the season between the High-A Fort Myers Miracle and the Single-A Cedar Rapids Kernels, pitching to a cumulative 4.09 ERA with 62 strikeouts in 36 games between the two teams. The following season, Faucher returned to Fort Myers, logging a 4.42 ERA with 61 strikeouts in 34 games.[7] Faucher did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.[8] Faucher began the 2021 season with the Double-A Wichita Wind Surge, but struggled to a 7.04 ERA in 19 games.
Tampa Bay Rays
On July 22, 2021, Faucher was traded to the Rays, alongside Nelson Cruz, for Joe Ryan and Drew Strotman.[9] Faucher improved his performance down the stretch, tossing 4.2 scoreless innings in 2 games for the Double-A Montgomery Biscuits and recording a 1.77 ERA in 20.1 innings across 11 contests for the Triple-A Durham Bulls.
He was selected to the 40-man roster following the season on November 19, 2021.[10] On May 9, 2022, Faucher was promoted to the Rays' major league roster.[11] He made his major league debut that day.[12] On September 27, Faucher collected his first career save, pitching the eleventh inning against the Cleveland Guardians and holding them to an unearned run.[13]
In 2023, Faucher made 17 appearances for the Rays, but struggled to a 7.01 ERA with 25 strikeouts in 25+2⁄3 innings pitched. On August 21, 2023, he was placed on the injured list with biceps tendinitis.[14] On September 24, Faucher was transferred to the 60–day injured list, ending his season.[15] On November 14, Faucher was designated for assignment after multiple prospects were added to the roster.[16]
Miami Marlins
On November 17, 2023, Faucher and Vidal Bruján were traded to the Miami Marlins in exchange for Erick Lara, Andrew Lindsey and a player to be named later.[17] He was optioned to the Triple–A Jacksonville Jumbo Shrimp to begin the 2024 season.[18]