Arcum's Weathervane , : Target snow land is no longer snow. , : Target nonsnow basic land becomes snow.
Reglamento oficial (Oracle)
[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.
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: Target snow land is no longer snow.