Quarantine Field
Where Oblivion Ring exiles one permanent for a fixed three mana, this scales the same templated effect by paying twice over: the doubled X in the cost is the lever, and every two mana past the white pips buys another isolation counter, which buys another exile target. The structure rewards waiting. Cast it early and it answers a single threat at a premium; hold it until the late game and it sweeps two, three, four nonland permanents in one resolution while staying a single object on the battlefield. That last detail is the real tension in the design. Because all the exiled permanents are tethered to one enchantment, a single piece of disenchant-style removal returns the entire haul at once: the more you exile, the more catastrophic the unwind. Concentrating value and risk into the same point makes it a different animal from running several individual exile enchantments, each of which would demand its own answer. The "up to one target" wording also lets you size the spell larger than the board demands, pre-loading counters you cannot immediately use, though the effect resolves only against what is on the battlefield when it enters. It is white's tax-by-scaling approach to mass removal: not a wrath that destroys, but a quarantine that holds, with all the conditional fragility that holding implies.
