Ruins of Urtistan

Ruins of Urtistan enters the battlefield tapped unless you control only Plains lands.
When this land enters the battlefield, return a land you control to its owner's hand.
{t}: add {w}{w} to your mana pool.
Much of that world still bears the scars of past Rune Wars. Nothing shows this better than the ruins of Urtistan. Once a great and prosperous utopia, now reduced to nothing but stone and dirt.