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Snow-Covered Plains

Card Name

Snow-Covered Plains

Type

Basic Snow Land – Plains

Rarity

Rare

Legal Formats

Commander, Explorer, Historic, Legacy, Modern, Pauper, Pioneer, Vintage

Not Legal Formats

Alchemy, Brawl, Standard

Rulings

(2/5/2021)
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.
(2/5/2021)
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.
(2/5/2021)
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.
(2/5/2021)
Some cards have additional effects for each {S} spent to cast them. You can cast these spells even if you don't spend any snow mana to cast them; their additional effects simply won't do anything.
(2/5/2021)
The Kaldheim set doesn't have any cards with mana costs that include {S}, but some previous sets do. If an effect says such a spell costs
1
 less to cast, that reduction doesn't apply to any {S} costs. This is also true for activated abilities that include {S} in their activation costs and effects that reduce those costs.
(2/5/2021)
In a Limited event (usually Booster Draft or Sealed Deck), you can't add basic snow lands to your card pool as you would other basic lands. You can play with basic snow lands only if you open them in your sealed deck or draft them.