Petrify
Pacifism's problem was always the same: it kept a creature home but left the utility running. A pinger still pinged, a mana dork still tapped, some artifact engine kept churning counters onto a faraway payoff. This aura closes that gap for the same two mana. By naming activated abilities alongside the combat lockout, and by widening the target to include artifacts, it neutralizes the class of threats the old lock was blind to: the tap-for-value permanents, the equipment and artifact engines whose danger was never in the combat step at all. That extra reach, at no premium over the baseline, is the reason to reach for it over auras that only touch attacking and blocking. What it still cannot do is answer a static or triggered ability; a lord keeps buffing, a death trigger still fires, an enchantment-based engine hums along untouched. It is a wrench thrown into the machinery rather than a shutdown of it. That places it in the long line of white "answer without answering" auras, the ones that trade the finality of destruction for a softer lock, along with the standing risk that the enchanted permanent gets bounced, blinked, or sacrificed back to relevance. The aura itself is a single motion, one enchant with no way to reset once it is dealt with. The gain here is not tempo; it is coverage.
