Dark Betrayal [Foil] is a card from the Theros set of Magic: The Gathering, classified as an Unknown rarity. Its current market value is approximately $0.40, reflecting its niche appeal among collectors and players alike. The card's ability to target and destroy black creatures makes it a strategic choice in various decks, contributing to its ongoing relevance in gameplay despite its modest valuation. Collectors may find its foil version appealing for its aesthetic and potential future value.