Land Dormant Volcano enters the battlefield tapped.
Uncommon
When Dormant Volcano enters the battlefield, sacrifice it unless you return an untapped Mountain you control to its owner's hand.
{T}: Add {1}{R} to your mana pool.
Illus. John Avon

2/1/2006: This has a triggered ability when it enters the battlefield, not a replacement effect, as previously worded.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander