Mox Diamond

Artifact   

When Mox Diamond comes into play, choose and discard a land card or sacrifice Mox Diamond. : Add one mana of any color to your mana pool. Play this ability as a mana source.

ST • ENDan Frazier

™ & © 1993—1998 Wizards of the Coast

Legal in: Tempest Block,Legacy,Vintage,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

Mox Diamond {0} Artifact 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.

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View this MTG card on Gatherer

5/1/2008
If you don't discard a land card, Mox Diamond never enters the battlefield. It won't trigger abilities that look for something entering the battlefield, and you won't get the opportunity to tap it for mana.

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Card Mox Diamond is not on TCGPlayer.