Snow Fortress

A defensive engine wearing a creature's clothes, and a snapshot of how early Magic expected players to spend mana defending the ground turn after turn. The body lands as a 0/4 Wall that cannot attack, but the three activated abilities convert it into a place to dump excess mana: one mana for power, one mana for toughness, three mana to ping a non-flying creature that is attacking you. That last ability is the design tell. It only hits creatures already swinging at you, and only ground ones, so the Fortress reads less like removal and more like a tax on the opponent's combat math: every attack into it risks losing a small creature to the ping, and the toughness pump lets the wall outlast what it cannot outright kill. The cost is the catch. At a mana per point and three mana per ping, the Fortress demands a turn where your mana has no better home, which is exactly the slow, grindy texture early sets cultivated. Modern walls have mostly abandoned this template: they draw cards, ramp, or block-and-fight in a single line rather than asking to be fed piecemeal across turns. What the Fortress preserves is an older premise about defense, that holding a position was meant to cost real resources, repeatedly, for as long as you wanted it held.