Rupture Spire (CM2) from Commander Anthology Volume II, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Jaime Jones
• Card Text:
  Ruptured Spire enters the battlefield tapped.
  When Ruptured Spire enters the battlefield, sacrifice it unless you pay 1.
  T: Add one mana of any color.