Imprisoned in the Moon

The trick is conversion, not destruction. Most blue removal undoes a permanent: bounce it, counter it before it lands, tuck it behind an Oblivion Ring effect. This Aura instead rewrites whatever it enchants into a colorless land that taps for a single colorless mana and nothing else, stripping every other card type and ability in the process. A planeswalker loses its loyalty and its activations; a threatening creature loses its attack and its triggers; an indestructible body loses everything that made it matter, because the answer never tries to kill it. That structural sleight (turning the thing into a mana rock made of dirt rather than removing it from play) sidesteps the protections that catch conventional answers: indestructibility, recursion keyed to a graveyard trip, anything that punishes a permanent for leaving. The enchant clause has boundaries that shape it, though: it fastens onto creatures, lands, and planeswalkers, but not artifacts or enchantments, so a problem artifact slips past it entirely. The other cost is permanence. The neutered permanent stays on the battlefield under its owner's control, dormant rather than dead, so any disenchant effect snaps the whole thing back: the walker returns with its loyalty, the creature stands up with its abilities intact, the land reverts to what it was. It trades the clean finality of exile for reach across three card types, accepting that one enchantment-removal spell undoes everything it accomplished.