Windriddle Ruins

When Windriddle Ruins enters the battlefield, it doesn't untap during your next untap step.
{t}: Add {u} or {r} to your mana pool.
The Windriddle Palaces were the pride of the Vazdurek Kingdom, beautiful filigree bastions of learning and enlightenment. The filigree was scoured away by the harsh winds of Cataclysm until all that was left was the ugly rock underneath.