Crumbling Necropolis (DDH) from Duel Decks: Ajani vs. Nicol Bolas, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Dave Kendall
• Card Text:
  Crumbling Necropolis enters the battlefield tapped.
  T: Add U, B, or R to your mana pool.