He has been in career best form since signing with the club .
Mitchell scored his first try for the club in the Cowboys 29 - 16 win against the Wests Tigers in Round 19 of the 2012 season .
Mitchell has been in career best form since signing with the club .
Mitchell scored his first try for the club in the Cowboys 29 - 16 win against the Wests Tigers in Round 19 of the 2012 season .