Snow

From MTG Salvation Wiki

Snow is a supertype that is found on Basic lands in Ice Age, and many cards in Coldsnap. Unlike other supertypes, Snow has no rules baggage; does not have an associated state-based effect, nor does it introduce a deck-building rule. Instead, some cards will give or gain benefits from the amount of Snow permanents you control.

Mana produced by a snow permanent is called snow mana. Snow mana may be spent as normal mana, but can also satisfy costs expressed by the mana symbol .

From the Comprehensive Rules: 205.4e Any permanent with the supertype “snow” is a snow permanent. Any permanent that doesn’t have this supertype is a nonsnow permanent, regardless of its name. Snow mana The snow mana symbol represents a cost that can be paid with one mana produced by a snow permanent. This is a generic mana cost that can be paid with any color or, or colorless, mana. Effects that reduce the amount of generic mana you pay don’t affect costs.

Snow is a replacement for the supertype "Snow-Covered", which is itself a replacement for the static ability with the same name. Cards that were formerly snow-covered received Oracle updates upon the release of the Coldsnap expansion set.

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Card types
Groups	Supertypes	Card types	Subtypes
Spell (non-permanent)		Instant	Trap	Arcane
		Sorcery
Permanent	Basic, Legendary, Snow, World	Artifact	Equipment, Fortification, Contraption
		Creature	(...)
		Enchantment	Aura, Shrine
		Land	(...)
		Planeswalker	(...)
Miscellaneous		Tribal	(...)
		Plane	(...)
		Vanguard
Obsolete	Mono, Poly, Continuous	Interrupt, Mana Source