Mox Diamond
Oracle 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.
: Add one mana of any color.
Card Rulings
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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