40. Rafael Betancourt (Rockies Career WAR 6.3)
Raffy was one of the best set-up men in MLB during his 6 years in Denver and 12 years overall. He only had 2 seasons with an ERA+ below 110. He arrived as a mid-season addition to shore up the bullpen for a playoff push.
He ended up completing his career in purple pinstripes with his best year as a Rockie coming in 2012 where he racked up 31 saves and a 2.81 ERA in 57.2 IP for a 166 ERA+.