Peacekeeper

A total cessation of combat enforced by a 1/1 body, with the entire design tension living in the upkeep tax. The static effect is symmetrical and absolute: nobody attacks, the controller included, which makes this a pure prison piece rather than a tool inside an aggressive plan. What stops it from being a free lock is the recurring payment baked into every upkeep, a soft cost that bleeds the controller's tempo turn after turn and rewards opponents content to wait out the mana commitment. That payment structure is the whole balancing act: the body is fragile and the effect is enormous, so Wizards priced ongoing access to the lock as a per-turn rent rather than a one-time fee. The result is a control card that demands a board and mana base capable of sustaining the tax while you advance a non-combat win condition, since your own creatures are forbidden from swinging too. The card sits among the early white tax pieces that forbid an entire category of action, the same design family that later produced more refined attack-denial and tax effects. Building the lock onto a creature rather than an enchantment trades durability for accessibility: it can be tutored, blinked, or recurred through creature-based toolboxes, which is the only real advantage its body offers over an enchantment doing the same job.