Gangrenous Zombies is a common Creature — Zombie card from Coldsnap Theme Decks (CST), collector number 127. Current market price: $0.32, TCGplayer market prices via Scryfall.
{T}, Sacrifice this creature: This creature deals 1 damage to each creature and each player. If you control a snow Swamp, this creature deals 2 damage to each creature and each player instead.