Dromar's Cavern (PLS) from Planeshift, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Franz Vohwinkel
• Card Text:
  Dromar's Cavern is a Lair in addition to its land type.
  When Dromar's Cavern comes into play, sacrifice it unless you return a non-Lair land you control to its owner's hand.
  T: Add W, U, or B to your mana pool.