This is based on the recent request to filter by color indicator. However, this is based on Color Identity. That is, World Breaker has a Color Identity of Green even though it is a colorless card. Right now it shows up under colorless cards, but if I search for green cards, I would like it to show up there. Or at least have an option to display cards based om color identity instead of color. Another example is Tasigur. He has an identity of BUG even though it is a black card.

This is used in Commander and takes the mana symbols in the mana cost as well as in the Text box to determine the color identity of the card.