Your search for "Fellwar Stone 254/342" revealed the following:
Fellwar Stone (DRK) from The Dark, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Quinton Hoover Card Text:T: Add 1 mana to your mana pool. This mana may be of any color that any of opponent’s lands can...
Fellwar Stone - C15 Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: John Avon Card Text:T: Add to your mana pool one mana of any color that a land an opponent controls could...
Fellwar Stone (C15) from Commander 2015, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: John Avon Card Text:T: Add to your mana pool one mana of any color that a land an opponent controls could produce.
Fellwar Stone (C16) from Commander 2016, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: John Avon Card Text:T: Add to your mana pool one mana of any color that a land an opponent controls could produce.