Arcum's Weathervane
Ice Age — uncommon
Artifact
Arcum's Weathervane rulings:
2006-10-15: Adds the snow or removes the snow supertype to or from a land. Adding snow doesn’t overwrite other supertypes.
2006-10-15: Can’t be used on a dual land to add the Snow Supertype even though it is a basic land subtype. You can use it on any land to remove the snow supertype.