I think there's limited options for Dame and most are in the East. A team like NOP/OKC have a ton of picks they can send back, but he's not going to want to wait.
My guesses would be:
PHI - Simmons and some other pieces/picks would work cap-wise while giving POR something to work with in return. Would cost PHI some good depth that they don't have on their roster
BOS - Have to figure Brown would be part of any trade and probably some expirings/future picks. Boston is fresh out of actual pick assets at this point and I'm not convinced that a Dame/Tatum team is enough to get out of the finals
NYK - Have the cap space, would need to send out a bunch of young players and picks, but Dame would get to be the guy. Could he convince Kawai to opt and team up?
GSW - Curry, Thompson and Dame? Not entirely far-fetched, but POR is going to have to take back Wiggins, ask for Wiseman and want multiple picks. Their tax bill is tremendous and it would give GSW a 3-4 year window for some more championships before they enter a total rebuild.