I was donated by a clan mate and I saw the donated troops heading to my clan castle. I also recieved a spell, but i didn't see it coming.
So now I'm asking to change that.
I suggest to use the same animation as when you drop the spell in a battle. It could drop on the clan castle when you recieve it but without the side effects (the poison circle, the cracks on the ground or the fast moving pink particles).
I hope you like my idea, give me some feedback :)

