结界, 3U (4) 在你的维持开始时,你可以选择目标由你操控的非地永久物,与目标由对手操控、且总法术力费用等于或小于前者的非地永久物,并交换它们的操控权。
Illus. Scott Altmann
Enchantment At the beginning of your upkeep, you may exchange control of target nonland permanent you control and target nonland permanent an opponent controls with an equal or lesser converted mana cost.1