Blizzard water gun isn’t recommended since you’re using Humar. Casts are the only ones that get a Blizzard ratio boost and water gun has bad accuracy . Central Control Area enemies have high evp so it wouldn’t work well .
Also I do recommend jizai , I use one myself and it’s pretty great , good accuracy , good power , 6 hits per combo. It’s hell seems pretty decent from my experience.
All those other weapons they mentioned above are great besides water gun for your class .