Journeyman

noun

1. A tradesman who has served an apprenticeship and is employed by a master tradesman
2. A competent but undistinguished tradesman, especially one who works, and is paid by the day
3. A player who plays on many different teams during the course of his career

   "The Los Angeles Lakers added journeyman forward Bob McAdoo to their roster in hopes that he could help them win a title."