The Atlanta Braves had a three-headed pitching machine for most of the 1990s and early 2000s, whether those three heads were Tom Glavine, Steve Avery, and John Smoltz or Glavine, Smoltz, and Greg Maddux, the team had consistent elite production in the front of the rotation for 15 years.
Two of those guys were around for the majority of the run, Glavine and Smoltz. Smoltz was acquired in 1987 from the Detroit Tigers for Doyle Alexander. Smoltz would make his debut the next season.