Fellwar Stone is an Uncommon artifact card from the Secrets of Strixhaven Commander set in Magic: The Gathering, designated as card #347. Valued at $0.00, it serves as a versatile mana source, allowing players to tap it for one mana of any color that a land an opponent controls could produce. Illustrated by John Avon, this card's accessibility and utility in various formats contribute to its appeal among collectors and players alike.