Rask, 28, is currently in the final year of his contract, so he will become an unrestricted free agent at the end of the season.
Rask could definitely help another team. After all, he has some interesting assets, as he is good in both directions on the ice. He could fit very well in a third center role in a team that lacks depth at that position.
What may make teams reluctant to claim him is obviously his $4 million salary. However, he will become an UFA this summer, so he would be a low risk bet. In the Habs' current situation, what does the team risk by trying him?