Assassin/Ninja Help Acrobat flight sustain

I have a level 68 acrobat right now so I don't have Jasmine bloom to help out
I'm wondering how much mana regen I'm gonna need in order to sustain flight against a single target with weightless smoke bomb and maybe? multihit
(also unrelated to flight sustain but how useful is Shurikens)

 

I’m not certain about the mana regen, but considering you don’t have Better Weightless yet, I would recommend at LEAST 40/5 mana regen. Higher is better.

Shurikens are really strong, I highly recommend using them if you can. They take some skill to aim them, but the damage reward is worth it in my opinion.