Stormplain Detainment

White's cleanest answer to a permanent that refuses to fit a single removal type has always been flexible exile, and this is the enchantment-shaped copy of that idea. It sits squarely in the Oblivion Ring and Banishing Light lineage: same "until this leaves the battlefield" duration, same trade of durability for breadth. Restricting the target to a nonland permanent an opponent controls means it can lift a planeswalker, a problem artifact, a battlefield-warping enchantment, or a creature with equal ease, and white does not care which shape the problem takes. The catch, shared with every card in this family, is that the exile is only as permanent as the enchantment. Destroy the detainer and the threat returns to the battlefield the instant it dies, so this reads as a stasis effect rather than a clean answer: against a field with cheap enchantment removal, the exiled permanent walks straight back. The modern "until this leaves" wording also closes off the old flicker trick that earlier phrasings allowed. Because the target is only exiled once the enter-the-battlefield trigger resolves, blinking or sacrificing the enchantment in response never banks a creature and never leaves it stranded; there is no engine to build here, only a spot answer that happens to be reusable if you can recur the whole permanent. It is exile priced for scope, with the price paid in fragility.