神器
你可以支付

并将由你操控的一个基本地移回其拥有者手上,而不支付旷雾界碑的法术力费用。
旷雾界碑须横置进场。

:加

或

到你的法术力池中。
As you cast a spell, you get a chance to activate mana abilities before you pay that spell's costs. Therefore, you may tap a basic land for mana, then both spend that mana and return that land to your hand to pay this card's alternative cost. (Of course, you can return a different basic land instead.)