Elbus the Blinding Blade

[mickeven]

Is {Elbrus, the Binding Blade}'s color identity for EDH colorless or is it black due to its flipside?

[griffin131]

Black.

[mickeven]

Black.

got it. thank you!

[Pi]

903.4c The back face of a double-faced card (see rule 711) is included when determining a card's color identity. This is an exception to rule 711.4a.
Example: Civilized Scholar is the front face of a double-faced card with mana cost {2}{U}. Homicidal Brute is the back face of that double-faced card and has a red color indicator. The card's color identity is blue and red.

[Lunis22]

I want to note that in this app when searching for solely colorless legendary creatures   {Withengar Unbound} is listed.

[Lunis22]

Also he is not listed under black legendary creatures.

[Kaylesh]

I think that has to do with the mana costs. The app does not check color identity.
Since Elbrus is colorless, the app considers it's flip side as colorless (my theory at least).
Due to the color marker, Withengar IS black.

[InfinitiveDivinity]

I think that has to do with the mana costs. The app does not check color identity.
Since Elbrus is colorless, the app considers it's flip side as colorless (my theory at least).
Due to the color marker, Withengar IS black.

Indeed, color identity is not a factor in this. The search is simply yielding cards based off of converted mana cost. For example, {Rhys the Exiled} would turn up in a solely {G} legendary creature search, even with it's {B}/{G} color identity.