Grindstone, a Rare card from the Tempest set in Magic: The Gathering, is currently valued at $12.61. Over the past 30 days, its market price has decreased by 54.9%, reflecting recent fluctuations in collector demand. With its unique ability to mill cards, it has maintained a niche role in various competitive formats, appealing to both players and collectors alike. As a #290 card in the set, its rarity contributes to its ongoing interest within the market.