Thinking that he might fit perfectly in Boston... learn from the best rat in the game, and potentially fill that 2nd line C spot.
I know Toronto wasn't mentioned, and that this type of deal would certainly be unconventional, but what about Max Domi @ 50% for Alex Kerfoot & a 3rd?
Obviously, not the haul of picks that Columbus would theoretically hope for, but get a serviceable player at $1.8m less with 1 year remaining for next year. Also worthwhile noting that Kerfoot has less than $3m remaining on his contract ($2.7 next year, 1/3 of $750k this year). Domi's real dollars is about $2m for the balance of this season.
From Toronto's standpoint, it would free up $850k in cap space to use elsewhere (assuming they're not going to utilize Muzzin's LTIR); and give them a different, more fiesty look on that 2nd line LW. Obviously, one of Kerfoot's important elements he brings to the team is the ability to play C in the top 6 in case of injury or suspension... which of course Domi has shown the ability to do in the past as well.
Domi's much more of a setup guy than a goalscorer... give him weapons like Tavares & Nylander; and it could be really, really dangerous.