Recycling some names I've mentioned with added rationale.
Targets that I think make some sense for the Celtics, and are at least plausible for the other team depending on how their offseason shakes out:
1. Trailblazers: Josh Hart (2/26 - Player Option Year 2). Hart is one of my sneaky favorite targets for the Cs. I think he'd fit right in like a bigger Derrick White at the 2-4 spots. White, Grant, and Hart off the bench would be beastly and super versatile in my opinion. Now, Portland probably wants to keep him. However, there is a chance they want to go big-game hunting in FA and open up as much cap room as possible. In that case, would Nesmith and a top 3 protected 1st to open up an extra 9 mil in cap space intrigue them?
2. Spurs: Josh Richardson (1/12.2). Nesmith and a 2nd? 2 2nds to open up more cap space for San Antonio? They have a glut of young wings (Vassell / Johnson / Primo / Walker / Langford) they need to develop. I would imagine J-Rich would be attainable.
3. Clippers: Marcus Morris (2/33) or Luke Kennard (3/43 - Team Option Year 3). The Clips are probably all-in with Ballmer's $, but they do have a MASSIVE tax payment coming up and maybe they view one of these guys as superfluous as they are set up to have a wing rotation including Kawhi / PG13 / Norman Powell / Marcus Morris / Robert Covington / Luke Kennard / etc. Would they bite at Nesmith and lotto-protected 1st (that they could re-purpose at the deadline as necessary) for Morris? Would they deal Kennard (who might not even get rotation minutes for them) for just Nesmith without picks attached for the massive savings?
4. Timberwolves: Malik Beasley (2/31 - Team Option Year 2). Beasley's name was floated at the deadline. Not sure if there's a match here. Nesmith and 2 2nds? I don't know if I would extend to include a lotto-protect 1st, and the Wolves would probably want one.
5. Hornets: Kelly Oubre (1/12.6). Nesmith and a 2nd? Not sure what Charlotte is going to do this summer. Feels like they are going to have a pretty severe roster shake-up one way or another as they try to get a starting C and re-center their roster around Ball and Bridges as opposed to Rozier and Hayward.
Unrealistic Long Shot:
6. Magic: Wendell Carter Jr. (4/50). Why would the Magic trade a good, young player that they just extended? They probably won't. But, they do have the first pick in a draft with 3 "bigs" as the top prospects. Maybe they want to go max cap space and try to lure LaVine or someone to Orlando. Anyways, could there be a scenario where they are willing to move Carter for say 2 lightly protected first round picks? Just spit-balling.
Names that probably don't make sense for the Celtics, but appear readily available:
7. Pistons: Kelly Olynyk (2/25). I don't think there's really a match here since we re-acquired Theis, but I included him just because he's a solid rotation player that can probably be had for cheap (TPE and a 2nd?).
8. Suns: Dario Saric (1/9.3). Similar to Olynyk. We probably don't need him since we already got Theis, but I'd bet he's very attainable as things are about to get expensive in Phoenix and Sarver is a cheapskate.