Your search for "Moss Diamond 301" revealed the following:
Moss Diamond (6ED) from Classic Sixth Edition, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Donato Giancola Card Text:Moss Diamond comes into play tapped.T: Add G to your mana pool.
Moss Diamond (C14) from Commander 2014, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Lindsey Look Card Text:Moss Diamond enters the battlefield tapped.T: Add G to your mana pool.
Moss Diamond (CMA) from Commander Anthology, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Lindsey Look Card Text:Moss Diamond enters the battlefield tapped.T: Add G to your mana pool.
Moss Diamond (Foil) (7ED) from Seventh Edition, available at 401 Games Canada. Rarity: Uncommon Finish: Foil Artist: David Martin Card Text:Moss Diamond comes into play tapped.T: Add G to your mana pool.