Weakstone's Subjugation

Pacifism for artifacts is the design lineage here, but the mechanism runs deeper than a combat lockout. For a single blue mana, this Aura strands whatever it lands on: as long as the enchanted permanent is tapped, it will never untap on its own. That framing matters, because the card does not tap anything by itself unless you choose to. The optional on entry is the whole engine: pay it and you tap the target down immediately, folding the untapped permanent into the lock the moment the Aura resolves. Skip the payment and you have spent one mana on a permanent that stays untapped and fully usable until its controller taps it for some other reason, at which point the Aura finally bites. That split is the tempo lever, and it keeps the cheap cast from being a real answer on its own. What it neutralizes is narrow but real: creatures that want to attack or block, vehicles, mana rocks, and any artifact or creature that leans on tapping to do its work. What it does not touch is just as important. Static abilities keep humming, and activated abilities without a tap cost keep firing, so an engine that never needed to tap is unbothered. And because the Aura stays on the battlefield as a legal target, the whole lock unwinds the instant anyone points enchantment removal at it, the same soft floor that has always undone Pacifism effects.