For Dallas this could be a win trade because they need a PG who can help Luka to lead this team plus Luka and Goran where both from Slovenia so they know how to play with each other and that could help Dallas to improve.
While for the Kings this trade could bring them back in the playoffs now that they have Siakam who coukd help offensively and defensively plus Siakam is the guy that could score 20 to 30 points in any night, so pairing Fox and Siakam could be unstoppable.
Lastly, for Raptors this could be a minor rebuild because they will have draft assets for the coming years and Having young player with Bagley that could be a Siakam in the future is good fit for the Raptors while Buddy Hield and Burke could be a good backcourt and Powell could be a Rim protector for this young team.