James Pazos
James Pazos might not be a name that you have heard of before unless you watch Mariners games but, over the last two seasons, he has been a good reliever in the past two seasons for the Mariners. Pazos, a 27 year old lefty, has averaged 60 appearances per season since 2017 with a 3.39 ERA (122 ERA+), a 3.83 FIP, and 3.4 walks and 9.5 strikeouts per nine innings.
In 2018, he was better than the average as his ERA was 2.88 and his FIP (aka Fielding Independent Pitching) was 3.60. His strikeout rate decreased to 8.1 per nine innings but his strikeout to walk ratio increased as he dropped his walk rate from 4.0 to 2.7 per nine innings.
The best thing about him is that he isn’t even arbitration eligible until next offseason so the Rockies would have four years of control of him until he would be eligible for free agency. In addition, he would be making around league minimum next season since he isn’t arbitration eligible (he has been at league minimum for the past two seasons).
If the Rockies were to trade for Pazos straight up, despite his control, the Mariners wouldn’t be demanding a big time prospect/s and, likely, one (or maybe two) low level prospects would get a deal done.