Cowed by Wisdom

The price of a full grip is total lockdown; the price of an empty one is nothing at all. That direct relationship is the entire design, but the meter belongs to you, not your opponent: this Aura taxes the enchanted creature's combat by one mana for each card in your own hand, which makes it a Pacifism whose strength you set by how many cards you are willing to hold. Sit on a hand of answers and the creature stays leashed; cash out your grip and the lock loosens by exactly as much. White rarely gets to disable a creature for a single mana, and this is the trick used to pay for it: the lock is real but conditional, tethered to a resource you spend down over the course of a game. It rewards the kind of patient, card-rich position that wants creatures off the board anyway, and quietly stops working once you have committed your hand to the table. The Pacifism family normally just shuts a creature off flat; this one instead builds a tax that rises and falls with your own card count, turning a static debuff into something whose value depends on how you play the rest of your turn. It is a Pacifism that costs the controller as much foresight as mana, strongest precisely when your hand is fullest.