Isolation Zone

The Oblivion Ring template, stretched to four mana and narrowed to two permanent types: creatures and enchantments. That trade tells the whole story of where it sits. Oblivion Ring and Banishing Light exile any nonland permanent for one less mana; this asks an extra white pip and gives up artifacts and planeswalkers as legal targets, gaining nothing in raw rate. What it buys instead is a double-white commitment that signals a heavily white deck, and a deliberately fenced-off slice of the answer space. The exile-until-leaves clause carries the same vulnerability its predecessors do: destroy the enchantment and the exiled permanent comes home, so it parks a threat rather than burying it, and any enter-the-battlefield value the target had is refunded on the way back. As removal it is honest about what it is, a deliberately costed, deliberately restricted member of the long line of "exile to a permanent" answers white has refined since the temporary-exile drawback first rode on bodies like Faceless Butcher. The narrowed target list is the cost of admission, not a flaw: strictly worse than Banishing Light against an unrestricted board, and exactly as good against the boards where creatures and enchantments are the only threats worth spending four mana to switch off.