HikingStick wrote:So, would it be better for the deck color to be based on the color of mana sources in the deck, rather than on the cards that are cast? In that case, however, we end up with the same scenario if someone is using a dual land for the wow factor, but has no intention of tapping for the second land color.
It can also be an issue with lands that tap for all 5 colors, what if you've got the obscure deck that uses all 5 color lands (City of Brass, Cavern of Souls, Reflecting Pool, Gemstone Mine, Lotus Vale, ECT) and you're only running 4 colors, I think that if a change is made that it should be just that you can manually list the color, format, and varient, some people don't like to list their commander as part of the decklist because it's not in the deck but that doesn't make it a 99 card vintage deck.
HikingStick wrote:In the overall scheme of things, how important is that designation? If you know the deck is only two colors, is it really a big deal?
IMO it's only an issue if you want other people to be able to look at your deck list when they're working on decks, for example I was looking at Dredge lists and I struggled to find lists that actually applied to mine because anything with a reanimation target was automatically extra colors and I couldn't tell which had the same base colors as mine.