I was thinking about this card the other day.
What if Neptulon got nerfed so his hands could ONLY attack minions with the windfury effect from the body? That way the only way the only damage you take from Neptulon's hands is their actual attack phase.
Or maybe taking out the hand's "Immune" keyword instead?
Obviously you can't nerf the mana cost since he already costs 10 so the next best solution is to change his effect somehow.