I think Horvat makes it to one of Boston, Minny, or LA.
Boston has cap space next year and has a lot of incentive to go all in this year with it likely being Bergeron and Krejci's final seasons. They don't really have a ton of good assets, but they can probably group up Debrusk, 1st, and Lysell. They can't win an outright bidding war though.
Minny has cap issues going forward, but they have a major hole in their lineup at 1C that Horvat can solve day 1. They have plenty of assets to throw at the deal in Rossi, Ohgren, Yurov, Faber, Lambos, 1st and 2nd round picks... and some bigger name guys in Greenway and Dumba as throw-ins. They can probably structure a deal.
Now LA... they, by far, have the most ammo. Not that they will dump him, but Byfield is the biggest expendable card that anybody has. Former #2 pick that has an elite toolkit... they could probably structure a 1 for 1 deal right there. Hurts them long-term, but LA is a solid team now if goaltending holds up. Add in Horvat and they have a Kopi-Horvat-Danault rotation. That could be very dangerous for the next couple years, and as Kopi fades into the sunset, Horvat-Danault is still competitive. They also have so many other pieces to structure things... Vilardi, Spence, Turcotte, Kupari, Fagemo, Grans and 1st and 2nd round picks.