Of course, Toronto and Colorado will always be linked together because of the Tulowitzki trade. However, there was another trade in 2018 that made a big difference for the Rockies as they made a postseason push.
Toronto dealt relief pitcher Seunghwan Oh to the Rockies on July 26, 2018, in exchange for minor leaguers Chad Spanberger, Forrest Wall, and Bryan Baker. In 25 regular-season games with Colorado in 2018, Oh would post a 2.53 ERA covering 21.1 innings, allowing 15 hits and 24 strikeouts.
The Rockies also traded catcher Miguel Olivo to Toronto in November of 2010 as part of a conditional deal after exercising his 2011 option. Olivo played just one season for the Rockies but he never saw action in a Jays uniform as he was granted free agency.
Olivo signed later that offseason with the Seattle Mariners where he had the longest stint (four years) of his 13-year big league career.