New INVISIBILITY Spell?

I know, i know your thinking well nope thats obviously wayyyyy too overpowered BUT its not ill explain why!

Okay so you know when your on 48-49% about to get at least a star when you realise that you only have 2-3 troops left and they are almost dead. Well heres where the invisibility spell comes in handy!

You can use it like any other spell BUT it only has half the radius of a normal spell and has 30-50% of the duration of a normal spell so if your troops are going to die and not finish the last building you can quickly throw the invis spell on them and all of the defences will stop attacking so they can destroy the last building and they would have to destroy it before the spell ran out ( so that you cant get troops to the town hall then put an invis spell down and have them take the whole 3 mins to destroy it while invisible!

Ill let you guys think about the stats etc im only town hall level 6 so i dont know too much just though it would be a good idea!

Thanks guys!