Gelid Shackles

Half a Pacifism, with the second half sold separately. The base mode here only shuts off blocking and activated abilities, which means the enchanted creature can still swing in freely: this is an Aura that defangs a defender, not one that pacifies an attacker. That makes it a curious inversion of the usual softlock template, which historically locked down attacking first. The activated-ability clause is the part that earns its keep against value engines: a tapper, a sacrifice outlet, a regenerator, a pinger all go quiet under it. The snow ability is what finally addresses attacking, and it does so on a per-turn, opt-in basis: pay one snow mana and the creature gains defender until end of turn, so you stop the alpha strike on the turns you can spare the mana and let it sit otherwise. That second mode is gated behind a snow-source manabase, which is the real cost of the design: white gets a cheap, repeatable creature answer that any deck can cast, plus an attack-stopping button that only the players who built a snow base can press. One caveat the templating creates: because it reads "enchant creature," it cannot hold down a creature-land permanently. The moment that land stops being a creature, the Aura has nothing to enchant and falls into the graveyard.