Too bad you don't have an IR...
I'm not sold on Kase being your answer. He's getting PP1 time but only playing 12 minutes a game on the 3rd line. Ducks are dealing with injuries so his pp deployment could quickly evaporate. He may be a decent stream option for the short term but I'm probably not ready to drop RNH for him.
Also can you confirm you'd have to use your waiver claim with him on the wire or did you mean he's a free agent?
It would help to know who else is available in free agency and the rest of your roster?