Snow-Covered Forest

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.

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 snow mana using mana that wasn't produced by a snow source.

Some cards have additional effects for each snow mana 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.