Donating spells

This idea would help out the Clashers Community in many ways. Donating spells would help out people who actually need them or dont have them. This idea would be more useful during clan wars. This spell should be added to your clan castle and as your castle grows, so does the amount of your spell capacity.
Take this idea under considiration

This is a cool idea that I had in mind but how would you drop the spell? The clan castle troops come on to the battlefield and fight, but spells have to be dropped in a certain location. If you drop your clan castle troops with a spell in an area where you can't spawn troops what would happen?