Frantic Purification

Disenchant has always been an answer that sits dead in hand until the opponent commits an enchantment worth killing, and that dead-card problem is exactly what madness exists to solve. Bolt the discard cost onto the same destroy-target-enchantment effect and the card converts a useless card-flow turn into a free answer: pitch it to a discard outlet, cast it from exile for a single white, and the enchantment is gone for the cost of the rummage you were already doing. The trade is real, though. You pay to hard-cast it, a full mana more than the genre standard, and the discount only materializes when a discard engine has already pulled the card out of your hand and into exile, where the madness trigger waits on the stack. That makes it a tension card rather than a rate card: in a deck with nothing to discard it to, it is a strictly worse Disenchant; in a deck built around looting and rummaging, it is one of the cleanest demonstrations of what the mechanic was meant to reward, an answer that costs you nothing because you were going to throw it away regardless. The flavor of the name lands the point: this is purification done in a panic, on the cheap, the instant you can spare a white.