The {S} symbol is a generic mana symbol. It represents a cost that can be paid by one mana that was produced by a snow source. That mana can be any color or colorless.
Narfi, Betrayer King
Snow isn't a type of mana. If an effect says you may spend mana as though it were any type, you can't pay for {S} using mana that wasn't produced by a snow source.
Snow is a supertype, not a card type. It has no rules meaning or function by itself, but spells and abilities may refer to it.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Christopher Lovell
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
