Corrupted Grafstone (SOI) from Shadows over Innistrad, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Bastien L. Deharme
• Card Text:
  Corrupted Grafstone enters the battlefield tapped.
  T: Choose a color of a card in your graveyard. Add one mana of that color to your mana pool.