Snowblind is a rare Enchantment — Aura card from Ice Age (ICE), collector number 264. Current market price: $0.91, TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets -X/-Y. If that creature is attacking, X is the number of snow lands defending player controls. Otherwise, X is the number of snow lands its controller controls. Y is equal to X or to enchanted creature's toughness minus 1, whichever is smaller.