スプリングフィールド・カージナルス
That first summer of 2010 in the Cardinals organization he played for the Batavia Muckdogs of the New York–Penn League, finishing the season with a 1.54 ERA and a perfect 6-0 win/loss record. In 2011, Gast split time between the Palm Beach Cardinals and the Double-AA affiliate Springfield Cardinals, posting a combined record of nine wins and eight losses. He started the 2012 season with the Springfield Cardinals again but in mid-May was moved up to Triple-A baseball with the Memphis Redbirds, finishing the year with a 13-7 record.