Mystic Reverb works on Haze's 1 ability, however, it is doesn't work with any other ability. Weirdly you can bind it to her 2 ability, obviously it does nothing. You can't bind it to her 3 ability which would be useful. You also can bind it to her ultimate, however it never procs. There is nothing in the tool tip that implies that it shouldn't work. So a recap, mystic reverb allows you to apply it to abilities that it will not proc on.