Healer

No this is a whole new unit that hasn't been taken or crossed out

This seems like more of a spell to me, because what if you had this troop over a group of archers. They could take out every building by freezing defenses and since there are so many of them, they would never be unfrozen unless the troop dies. But this troop won't die because air defenses will be frozen. I don't see how this troop could be stopped other than traps, which players cannot be forced to rely on. As a spell that only lasts for a few seconds, I think this is a great idea, but as a troop it is way too OP.