haven't found an answer & seems apropos to ask re: "more than one color identity": can "faceless one" be your Arthur (i can't see why it couldn't, short of its being banned/restricted in format; it's a common creature)? if so, do you also get to choose a common background as an additional commander?

agreed. i always try to remember this Batman panel from the "identity crisis" miniseries when i'm trying to figure out why something doesn't make sense or seems off