Cover of Winter

A fog you can renew, and a fog whose price you keep paying. Most damage-prevention enchantments either fire once or sit on the battlefield as a tax-free static wall; this one builds its prevention out of age counters and then charges snow mana for each of them every upkeep. The result is a feedback loop: the longer it survives, the more damage each attacker has to push through, but the cumulative upkeep climbs in lockstep, so the same counters that strengthen it are the ones that eventually bankrupt it. The activated ability that adds a counter manually is the lever for front-loading protection ahead of an alpha strike, at the cost of accelerating the very clock that forces the sacrifice. The prevention itself is unusual in shape: X damage is prevented from each attacking creature individually, not split across the whole attack, which makes this a wall that scales against the wide board rather than the single fattie. A handful of small attackers can be blanked outright while one large creature still lands a meaningful hit, so it answers go-wide aggression best, and answers it cheapest while it is youngest. It does nothing against noncombat burn, and its entire arithmetic is tethered to a steady stream of snow mana to stay alive past its first few turns. The design captures a particular tension of its era: cumulative upkeep as a self-limiting timer bolted onto an effect that wants to compound, leaving you to decide each upkeep whether one more age counter of safety is worth keeping the whole structure standing.