Gruul Signet is a Common artifact card from the Guildpact set of Magic: The Gathering, identified by card number 150. It provides mana acceleration by allowing players to convert one generic mana into red or green mana. Currently valued at $19.98, its market price reflects the card's utility in various deck strategies, particularly within Gruul-themed archetypes. Collectors often seek this card for both gameplay and completion of set collections.