What do you think about a troop that controls enemy troops?

In my opinion this troop must be weak and it works such as an healer (it remains behind other troops). Enemy troop are weakened in damage.

I suggest you to read the stickys and put some effort on your suggestion. Make some samples, story, examples of costs etc.

You need to be more detailed, add some stuff like the training cost, whether its a dark troop or elixir troop, hitpoints, DPS, what level barracks it's unlocked at, the cost of unlocking, the appearance, etc.