Cover of Winter

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.) 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 enchantment. {S}: Put an age counter on this enchantment.

From Magic: The Gathering.

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