Elbrus, the Binding Blade, is a Legendary Artifact - Equipment that transforms into Withengar Unbound, a Black Legendary Demon. Can I use Elbrus/Withengar as a Commander, and if I can, is my deck colorless or black?
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Here's an official ruling from Sheldon Mennery, who is the authoritative source for Commander rulings:
Elbrus, the Binding Blade is not a Legendary Creature, so it cannot be your Commander. It doesn't matter that it could become a creature. In fact, I'd be surprise if there is a card that couldn't become a creature.