I'ma be straight, in my opinion this is garbage. I main Azure, always have and always will. Compared to other mains, this skill needs a bit of a rework.

My suggestion:

-25% or -30% Healing, but can revive 1 ninja to %25 HP every 2 turns.

This is basically Sage Kabuto's Powerful Regenerative Jutsu but a little stronger but with more dedication.

I know it sounds insane, but the healing isn't amazing as is. I wouldn't mind it taking a hit and having to reinforce it with 'Medical Tips'.

This way water main would have more utility as a healer over just being a set crit machine or healing replacement.