insulating spell

A defensive spell with an ability to oppose the lightning spell. The spell should cover the same radius as the lightning spell and can be placed anywhere inside or outside the base.

The maximum amount of these spells you can have at a time should be 1. And each spell shall last for 12 hours or a lightning strike. It shouldn't be visible to the attacker and should be able to block away the lighning spell dropped in the area covered.

Costs: around 40k to 50k elixir

Advantages: this kind of spell would have a lot of advantages at all levels.
In the lower (farming) ranges the people can use them to cover their loot storages (such are dark elixir storage) which often gets looted by many players using lightning spells and pisses us off.

In the higher trophy ranges where the loot doesn't matter this spell can have a lot of significance in repelling the lighting spell used to kill the clan castle troops by the gowipers. An elegant placement of this spell would result in no death of witches and important defensive wizards from the clan castle thus boosting the defenses.

Cooldown period: after the usage of one insulating spell, the next one can be only created after a period of 3 hours, thus giving attackers some advantage aswell.

Leveling up: leveling up the spell would increase the radius cover aswell as the number of lightning spells it can take, but also increases the cooldown period, and the cost of making it.

This spell can prove very benificial to everyone, and can be a gamechanger, so please give a look at it, and comment on the idea.

P.S: I also thought about an anti-rage spell which decreases the speed and damage of the troops in the area affect by it. Please give your views and thoughts about it.