The protection ability means the following: - Mistmeadow Skulk can't be blocked by creatures with mana value 3 or greater. - Mistmeadow Skulk can't be enchanted by Auras with mana value 3 or greater. It also can't be equipped by Equipment with mana value 3 or greater. - Mistmeadow Skulk can't be targeted by spells with mana value 3 or greater. It also can't be targeted by abilities from sources with mana value 3 or greater. - All damage that would be dealt to Mistmeadow Skulk by sources with mana value 3 or greater is prevented.