Glacial Plating is a uncommon Snow Enchantment — Aura card from Coldsnap (CSP), collector number 7. Current market price: $0.34 (foil $3.99), TCGplayer market prices via Scryfall.
Enchant creature Cumulative upkeep {S} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it. {S} can be paid with one mana from a snow source.) Enchanted creature gets +3/+3 for each age counter on this Aura.