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.
: Add one mana of any color to your mana pool.
From the Vault: Relics (V10)
#10, Mythic Rare
Illustrated by: Volkan Baga
Multiverse ID: 212634