This isn't Saber at all, but rather Archer.

Are you suggesting we adopt the tag Artoria instead?

Oh! This is from the Ask Seiba blog on tumblr! Very lovely art. The artist's personal tumblr handle seems to be silenri. I'll tag this as such (if only for lack of a better idea of what to tag them as.)

(I believe the ask was something to the extent of 'what would you look like as an archer class?')

added what_if tag, this really looks like a archer-class Arturia, and its awesome