Your search for "Marble Diamond 248" revealed the following:
Marble Diamond (C14) from Commander 2014, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Lindsey Look Card Text:Marble Diamond enters the battlefield tapped.T: Add W to your mana pool.
Marble Diamond (CLB) from Commander Legends: Battle for Baldur's Gate, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Gaboleps Card Text:Marble Diamond enters the battlefield tapped.T: Add W.
Marble Diamond (Foil) (CLB) from Commander Legends: Battle for Baldur's Gate, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Gaboleps Card Text:Marble Diamond enters the battlefield tapped.T: Add W.
Marble Diamond - Rulebook Showcase (CLB) from Commander Legends: Battle for Baldur's Gate, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Phil Stone Card Text:Marble Diamond enters the battlefield tapped.T: Add W.
Marble Diamond - Rulebook Showcase (Foil) (CLB) from Commander Legends: Battle for Baldur's Gate, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Phil Stone Card Text:Marble Diamond enters the battlefield tapped.T: Add W.