Glacial Plating [Coldsnap]

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 permanent.) Enchanted creature gets +3/+3 for each age counter on Glacial Plating.