Okay, while I think the idea of primarily using Black Keys as a casting tool is very interesting, I have to question how he can use them, as they are a Church tool. ^^; That's really my only problem here, though I will point out there are only specific cases where a Master can fight a Servant successfully(such as melee with a reinforced Master against a Caster, and even then that's probably not going to actually kill the Servant).