The Miami Marlins
The Miami Marlins are a team on the periphery of being able to get a playoff spot as they are 47-52 and five games back of the final NL Wild Card spot. However, they already have a good nucleus and could surprise some people if they get enough offense in the mix. Shohei Ohtani could obviously help with that.
Offensively, All-Star Garrett Cooper (their primary DH) is on the IL. Also, Jazz Chisholm Jr., Brian Anderson, and Jorge Soler are all on the IL. As a team, their wRC+ is 95, which is 20th in the sport.
For the starters, Sandy Alcantara and Pablo Lopez have been two of the best starters in the sport. Braxton Garrett has also been good. However, Trevor Rogers has regressed a lot and Eliser Hernandez is on the IL and has struggled.
For the return to the Angels, the Marlins have three prospects in MLB’s Top 50.
The St. Louis Cardinals
The Cardinals only have four starters with at least 10 starts. Two of of them are on the injured list. Three more pitchers have at least five starts and two of them have an ERA of 4.85 or higher. Their team ERA is 4.06, or 17th in baseball so they need to address it.
Offensively, Albert Pujols has only been a part-time DH (38 games) but five more players have done it at least a dozen times. Pujols has played first base some as well so Ohtani could take over the reins there while still giving Pujols as much playing time as he has had so far.
They also have five top 100 prospects.