First printed in Stronghold (1998)
All 3 prints
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Tempest Remastered (TPR) #228, 2015 (digital)
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From the Vault: Relics (V10) #10, 2010
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Stronghold (STH) #138, 1998
Mox Diamond 
Artifact
If this artifact would enter, you may discard a land card instead. If you do, put this artifact onto the battlefield. If you don't, put it into its owner's graveyard.: Add one mana of any color.
In the last 30 days 5.8% of Legacy decks played it (6 of 104). Most played in Mono-Green (unclassified). In the last 30 days 19.5% of Premodern decks played it (8 of 41). Most played in WG (unclassified).
Staple
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Legacy staples:
main deck, 6% of decks (#114)
Colorless, Artifacts, Ramp, Mana rocks -
Premodern staples:
main deck, 20% of decks (#25)
Colorless, Artifacts, Ramp, Mana rocks
Last 120 days of MTGO results.
Legality
Constructed
- Standard Not legal
- Pioneer Not legal
- Modern Not legal
- Legacy Legal
- Vintage Legal
- Pauper Not legal
- Future Standard Not legal
- Historic Not legal
- Timeless Not legal
- Alchemy Not legal
- Penny Dreadful Not legal
- Premodern Legal
- Old School 93/94 Not legal
Singleton
- Gladiator Not legal
Commander formats
- Commander Legal
- Duel Commander Banned
- Pauper Commander Not legal
- PreDH Legal
- Tiny Leaders Banned
- Oathbreaker Legal
- Brawl Not legal
- Standard Brawl Not legal
- Competitive Brawl Not legal