Smoldering Spires (E01) from Archenemy: Nicol Bolas, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Rob Alexander
• Card Text:
  Smoldering Spires enters the battlefield tapped.
  When Smoldering Spires enters the battlefield, target creature can't block this turn.
  T: Add R to your mana pool.