Health stones that require melee range to an enemy, a GCD, 2 runes and are susceptible to armor, damage reduction, avoidance, resilience as well as heal debuffs.
Edit: Forgot damage debuffs and disarms.
The fact alone that you think that this ability is somewhat balanced removes all your credibility. It's blatantly overpowered and anyone that dare say it isn't is completely wrong.
PS: don't bring the "says the paladin", I know I'm op.