[4] The Colorado Rockies selected Butler in the first round of the 2012 Major League Baseball draft.

[6] Butler made his professional debut with the Grand Junction Rockies of the Rookie-level Pioneer League, and was named an All-Star after going 7–1 with a 2.13 ERA and 55 strikeouts.

[11] Butler made six starts for the Tulsa Drillers of the Double-A Texas League to conclude the season.

On July 27, 2018, Butler (along with Rollie Lacy and Alexander Ovalles) was traded to the Texas Rangers in exchange for Cole Hamels.

[27] On June 17, 2020, Butler signed with the Chicago Dogs of the American Association of Independent Professional Baseball.

On May 4, 2021, Butler signed with the Southern Maryland Blue Crabs of the Atlantic League of Professional Baseball.

[28] However, the next day, the Kansas City Royals organization purchased Butler's contract and assigned him to the Triple-A Omaha Storm Chasers.

[30] On April 13, 2022, Butler signed with the Southern Maryland Blue Crabs of the Atlantic League of Professional Baseball.

[31] Butler started 26 games for the Blue Crabs in 2022, posting a 12–6 record and 4.94 ERA with 94 strikeouts in 155 innings pitched.

On January 27, 2023, Butler was traded to the Charleston Dirty Birds of the Atlantic League of Professional Baseball in exchange for infielder Jose Rosario.