Gangrenous Zombies

Tap it, sacrifice it, and the board takes a point of damage; that is the baseline this Zombie offers, a fair-to-mediocre Pestilence-in-miniature stapled to a forgettable body. The interesting clause is the snow rider. Controlling a snow Swamp doubles the output to two damage across the board, which is the difference between mopping up tokens and killing a genuine two-toughness creature while chipping the opponent's life total in the bargain. The structural detail worth noting is that the snow check happens on resolution, not on activation, so it is a deckbuilding tax paid up front in your manabase rather than a trick you assemble at the table: you earn the bonus by having already committed to snow basics, not by drawing into them. That is exactly the lesson Ice Age was built to teach. Snow lands were the set's mechanical signature, and the reward for adopting a land subtype that cost almost nothing was meant to be small, automatic, and persuasive: run snow Swamps and your spells quietly improve. This card embeds that whole pitch into a single sacrifice ability. Stripped of the snow text, it joins the long line of self-immolating tap-and-sacrifice damage creatures black has produced over the years; what distinguishes it is the rider tying its ceiling to the manabase that defined its home set.