Which is exactly the point.

The entire fact that generic colorless mana is colloquially referred to as brown (which last I checked was a color) just backs up my point.

Colorless isn't it's own color, but it is the closest thing we have or are going to get to a "sixth" color.

dual color karoos wee also printed in one of them

Here's hoping for a new set of lands in Amonkhet. Come on Wizards. We waited long enough.