That second option isn't "white enough" IMO. First of it's destruction rather than exiling (though destruction does appear quite often when the spell targets tapped creatures or those in combat) and second, it just straight-up removes the creature without any compensation to that creature's controller or possibility of recourse.

"Destroy target non-Human creature" sounds very much like a text could appear in a card instead. Ie. Eyeblight's Ending.

I could see a plane where "Non-human" is considered sufficient provocation for White to attack it. It'd be quite a statement though.

Yeah, sure, xenophobia is a thing in , but how much should the flavor be able to define the limits of the color pie? I mean, it could technically work in white even if it were "non-(any type really)" as long as that creature type was the most prominent one in in this setting.

Indeed. It's pushing things; but might be OK in some environments.

Eh, maybe; in that case I would go with that second ability only or at a CMC of 4+. I still think it's at least too competitively costed given that it's quite flexible since it has that first option as well. This line of thought is more in the Hornet Sting territory though which is questionable (justifying bends with a higher mana cost).

It does look similar to Feast or Famine btw.

Flavor in this card is nice regardless.

Moved to uncommon. Also, I would just like to add that destroying non-human creatures is definitely in flavor for white. The Order purports to be a people of healing and help, but instead wish to subjugate all non-humans on the shifting plane, believing humanity to be the only group that matters.