Cold Snap
Enchantment
Oracle Text
Cumulative upkeep
(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.)
At the beginning of each player's upkeep, this enchantment deals damage to that player equal to the number of snow lands they control.
Rules for this card
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A keyword ability that imposes an increasing cost to keep a permanent on the battlefield. See rule 702.24, “Cumulative Upkeep.”