[quote=@Zobozun]
I'm unfamiliar with Fate, but wouldn't that mean that there'd be no point in having Excalibur on the CS in the first place if it's too expensive to ever use?
I mean, if it's that draining, then just summoning it would deplete her mana and cause her to cease to exist the second she tried it, right? So, like, that's not even a suicide attack, really. It's just flat-out suicide.
That seems a bit silly is all. You might want to trade it out for something cooler and more usable.
[/quote]

Eh, Archer never projects it; Shirou only projects it to use it. Arguable that it can be projected (though that seems more mentally damaging) but there's no worth in it without activating the ability... which drains all of Saber's mana for ONE attack. Saber eclipses them. Hence the suicide.