Sorcery, XUUU (3)
Rare
Destroy X target Mountains. Volcanic Eruption deals damage to each creature and each player equal to the number of Mountains put into a graveyard this way.
Illus. Douglas Schuler

10/4/2004: Can be used with X equal to zero. This is useful if no Mountains are on the battlefield.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Commander