Glacial Vent

At the beginning of your upkeep, put a thaw
counter on target snow land. (It becomes thawed,
and isn't snow, as long as it has a thaw counter.)
Sacrifice a thawed land you control: Glacial Vent
deals 2 damage to you, then choose one—
• Add {3}
• Glacial Vent deals 3 damage to any target.