The 91-72 Rockies made the postseason for the second consecutive year in 2018 but lost to the Milwaukee Brewers in the National League Division Series.
Ian Desmond was the Rockies' primary first baseman last year, but it seems Colorado is intent about moving on. Desmond hit 22 home runs and knocked in 88 runners in 2018, but he slashed just .236/.307/.422 and finished with a negative WAR mark for the second straight year.
Cleveland Indians designated hitter-first baseman Edwin Encarnacion seems like the least plausible candidate to be moved to Denver simply because he rarely plays in the field anymore. That wasn't a problem in the American League, where Encarnacion can play DH, but it would be in the National League.
Encarnacion, who is entering his age-36 season, has only played 46 games at first base since the beginning of 2017.
Wil Myers of the San Diego Padres could work, though he's owed $73 million over the next four seasons. Still, he'll be just 28 on Opening Day and smacked 58 home runs in 2016 and 2017 before injuries curtailed his 2018.
Carlos Santana and Jose Abreu seem most plausible. Santana just got dealt to the Seattle Mariners in the Jean Segura deal, but the Mariners seem intent on blowing up their roster if that move and the Robinson Cano-Edwin Diaz trade with the New York Mets are any indications. The durable Santana will turn 33 in April, hit 24 homers last year and hasn't played fewer than 143 games since he was a rookie in 2010.
Abreu had a down 2018 for the Chicago White Sox with his OPS dipping to .798 from .906 in 2017, but he doesn't have a long-term deal and is entering his age-32 season. He could be a great fit in Coors Field after hitting in the pitcher's park that is Guaranteed Rate Field.