The Rockets getting Drexler in 95, Astros getting Johnson in 98, and Beltran in 2004 come to mind as making the list.
The Rockets simply don't win title #2 without Clyde.
The playoffs on 98 never happened - they never happened. Weighing Beltran's importance to that 04 club, well he was simply spectacular. For 2 weeks he was the best player in either league, and not by a little.
Hard to put Verlander, Clyde, and CB in a rank order. Not hard to say that Verlander is a hall of fame player at the peak of his craft and its been freaking awesome to watch.