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Snow Fortress definitely doesn't feel like it should be a creature, and I'm not sure about the 'artifact' part

This is weak against an opponent with a lot of creatures on the battlefield but allows black to kill some creatures it otherwise would have trouble killing (like creatures with protection from black)

The plot ability is interesting too, perhaps allowing you to save the card for the right moment, where you have spells in hand that can make the most of the prowess MTG keyword

Thats true of most of the cycle, but this one doesnt affect the game state at all, and the set has little else to support a mill engine