Laine’s value is at an all-time low, that said he only has 2 more years in his contract and he’s still relatively young, so not an anchor at all. However, I see CLB a year or 2 behind MTL in terms rebuild/competing for a PO spot so they may see Laine “outside” their core given his age/contract situation. Also, given his off-ice issues they may feel that a new spot is better for him.
All this to say that if I’m CLB I would want a draft pick and a prospect for Laine. The prospect and pick all depends on how much faith the team trading for Laine has. If I’m MTL, I would give the Jet’s 1st plus Mesar.
This may seem like a lot but i could see Laine rebounding really well with the Habs. He would either have Suzuki or Dach feeding him the puck. His linemates would be any of the following two Suzuki/Caufield/Slaf/Dach/Newhook which is a whole lot better than anything CLB has to offer other than Gaudreau (who’s a winger). Also, the Habs are not getting into 5+ year affair, just 2. So if he doesn't pan out then you're saddled-bagged with multiple years.