No there isn't. There are commons that tap for all colors and enter tap while requiring you to pay 1, and there's a land that taps for C that makes one mana of any color when it enters.
It's a tap land that can sometimes filter your one color to the other color. That's very unimpressive, but it's still strictly better than the taplands, so it would be a fine uncommon.
I would make it 1 instead though.