Woodland Chasm

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.

The snow mana 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.

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.