Faceless Haven

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 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.

If Faceless Haven becomes a creature but hasn't been under your control since the beginning of your most recent turn, it can't attack or be tapped for mana.