Frostwalk Bastion

Manlands buy their power with the friction of costing you a colorless-producing land tapped in every attack step, and this one tightens that bargain twice: it costs no mana to play but demands snow to animate, so the deck that wants a 2/3 out of its land has to commit to a snow-based mana base to get there. The payoff sits in the combat trigger. Damage to a creature does not just deal damage; it taps the blocker and locks it down through its controller's next untap step, which turns a modest body into a repeatable tempo lever. Attack, connect, and the defending creature is neutralized on both ends of the exchange: it cannot block again next turn and it cannot swing back. That effect reads like a colorless echo of a keyword usually reserved for blue and white control shells, folded into a land that dodges sorcery-speed removal by simply being a land until you choose otherwise. The snow requirement is the whole hinge. Without a snow theme it is a colorless-tapping land that does nothing else; with one, it is a land that closes games and grinds down defenders while surviving every sweeper aimed at the board. That is the kind of design that rewards a manabase built for it rather than one that merely tolerates it.