[Résolu] can Elbrus, the Binding Blade be a general?

so how do these flip cards work when building EDH decks?

can Elbrus, the Binding Blade be a general? (if so is it colorless or black)

does garruk need to be in a black and green deck?

why?

Elbrus, The Binding Blade is'nt a legendary creature. It can't be a general.

Your general need to have at least green and black colors if you want to play Garruk Relentless.
For transform cards, both sides contribute to the color identity for an EDH deck.