SA16
Sixstring
Taking on a bad contract when dealing with another team is pretty common. Unconventional might be participating in a deal between two other teams as a facilitator. For example the Lightning and Senators want to deal, but the Sens won't take on salary and the Bolts have to dump some. So the Rangers get a few picks or a prospect in exchange for taking Callahan.
Still, the truly unconventional move is an offer sheet. I still have a hard time seeing a rebuilding team going with that option though. What guy could they offer sheet that guarantees that their 1st in 2020 isn't a lottery pick? Nobody that I can think of.
The players to offer sheet are Kapanen and Johnsson. There's no way the Leafs can sign both of them with Marner.