Firespout
Sorcery
Oracle Text
Firespout deals 3 damage to each creature without flying if
was spent to cast this spell and 3 damage to each creature with flying if 
was spent to cast this spell. (Do both if was spent.)
Rulings (3)
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Wizards of the CoastThis spell cares about what mana was spent to pay its total cost, not just what mana was spent to pay the hybrid mana symbol in its cost.
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Wizards of the CoastThis spell checks on resolution to see if any mana of the appropriate colors were spent to pay its cost. It doesn’t matter how much mana of that color was spent; the effect isn’t multiplied.
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Wizards of the CoastIf this spell is copied, the copy will not have had any colors of mana paid for it, no matter what colors were spent on the original spell.