Well, Saber, Archer and Rider are ranked as B in magical energy. Lancer is C, Assassin is E, canon Berserker is A, and Caster is A+. I would put Evangeline, assuming she isn't sealed, at around B rank as well.
Incidentally, if you don't mind a suggestion, when they do attack and try to drain Caster, I'd like to see her go "Who do you think you are?", and reverse the drain. She's the Servant that specializes in magic, and she's spend the entire War draining magical power from the city. She's not going to give that up without a fight.
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Stand between the Silver Crystal and the Golden Sea.
"Youngsters these days just have no appreciation for the magnificence of the legendary cucumber." --Krityan Elder, Tales of Vesperia.
Incidentally, if you don't mind a suggestion, when they do attack and try to drain Caster, I'd like to see her go "Who do you think you are?", and reverse the drain. She's the Servant that specializes in magic, and she's spend the entire War draining magical power from the city. She's not going to give that up without a fight.
-----
Stand between the Silver Crystal and the Golden Sea.
"Youngsters these days just have no appreciation for the magnificence of the legendary cucumber." --Krityan Elder, Tales of Vesperia.