Mox Diamond (Foil) (V10) from From the Vault: Relics, available at 401 Games Canada.

• Rarity: Mythic Rare
• Finish: Foil
• Artist: Volkan Baǵa
• Card Text:
  If Mox Diamond would enter the battlefield, you may discard a land card instead. If you do, put Mox Diamond onto the battlefield. If you don't, put it into its owner's graveyard.
  T: Add one mana of any color to your mana pool.