New Dark Voodoo Witch Doctor

The Voodoo Witch Doctor
Comes from a far land bringing the ability to heal flying troops, and converting enemy troops with bolts of green light. Unfortunately he cannot get threw walls so if his flying comrades get too far he cannot heal them.

Level 1
Cost: 300 dark elixer
Training time: 20 min
House space: 15
Movement speed: 20
Healing: 60
Enemy converting: 5 troops max
Hit points: 1200
Available at: dark barracks lvl 6
Upgrades at lab level: 6-8

With each upgrade increases his healing power by +10%, converting troops +5, hit points by +100, and cost by +30 dark elix each Voodoo doctor.
Level 2 upgrade cost: 60,000 dark elix
Level 3 upgrade cost: 80,000 dark elix
Level 4 upgrade cost: 100,000 dark elix

Seems a little op in my opinion. It shouldn't have the ability to convert troops. Imagine converting dragons or P.E.K.K.As

It would take 4 lvl1 voodoo witch doctors to convert a dragon to fight for you and etc... So if a enemy clan castle had 20 archers in it and you deployed one lvl 1 voodoo witch doctor he could only convert 5 archers and the other 15 would still be attacking you