"Insidious Will [Foil]" is a blue instant card from the Kaladesh set of Magic: The Gathering, holding an Unknown rarity. Currently valued at $0.98, it provides players with a strategic option by allowing them to counter a spell or gain control of an opponent's spell. The foil version adds a visual appeal that may attract collectors and players alike, contributing to its market presence. Its value reflects its niche utility and the ongoing interest in Kaladesh cards.