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Tundra Fumarole deals 4 damage to target creature or planeswalker. Add 
for each 
spent to cast this spell. Until end of turn, you don't lose this mana as steps and phases end. ( is mana from a snow source.)
Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.
