Cover of Winter
{2}{W}
Snow Enchantment
Cumulative upkeep {S} (At the beginning of your upkeep, put an age counter on ~this~, 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.)
If a creature would deal combat damage to you and/or one or more creatures you control, prevent X of that damage, where X is the number of age counters on ~this~.
{S}: Put an age counter on ~this~.