Halls of Mist

A colorless land that taxes momentum rather than blanking a single swing: the design goal here is to punish sustained aggression by denying any creature a second consecutive attack. The first assault lands unimpeded; it is the follow-up that the static ability locks out, freezing every creature that attacked on its controller's previous turn. Against a swarm that wants to keep swinging every turn, that converts a steady beatdown into a stuttering one, and a defensive deck can alternate its own assaults around the brake while the opponent's board idles every other turn. What stops the lock from being free is the escalating upkeep: paying the first turn is trivial, but each age counter compounds the tax, so the land keeps asking whether you can still afford the brake or whether you let it slide off the table. That self-defeating friction is the era's signature balancing lever, the same clock Ice Age stapled to its other oppressive permanents, and it turns a potentially board-warping effect into a timer that runs against the controller as surely as it runs against the attacker. The result is a land that wants a board it can stabilize fast, before the upkeep math turns the defensive engine into a liability of its own making.