I'm putting together this list of Legendary Creatures with CI different from their Mana Costs for reference. (If mods could maybe sticky this once the list is complete, that would be awesome)

Bosh, Iron Golem (colorless, CI: R)
Memnarch (colorless, CI: U)
Daghatar the Adamant (White, CI: WBG)
General Tazri (White, CI: WUBRG)
Archangel Avacyn (White, CI:WR) (Thanks Lumination!)
Shu Yun, the Silent Tempest (Blue, CI: WUR)
Tasigur, the Golden Fang (Black, CI: UBG)
Alesha, Who Smiles at Death (Red, CI: WBR)
Yasova Dragonclaw (Green, CI:URG)
Daughter of Autumn (Green, CI:WG) (Thanks Sovarius!)
Thelon of Havenwood (Green, CI:BG) (Thanks Sovarius!)
Rhys the Exiled (Green, CI:BG) (Thanks Sovarius!)
Ishkanah, Grafwidow (Green: CI:BG) (Thanks Lumination!)
Samut, Voice of Dissent (RG, CI: WRG) (Amonkhet release)

Did I miss any?

Not to say it's not interesting -- but why sticky the thread? Why would this be something that someone needs to find?

Mainly to have a quick reference for newer players so they have an example of he complexities of Color Identity, and a list of commanders that they normally wouldn't think of.

^ I should pay more attention to new sets, haha

Added Samut, Voice of Dissent

I think you should make a generalized version of this forum for stuff like blind obedience and Trinisphere too. A lot of people are going to see this forum and complain about how extort is a B/W colour identity.