Arcane Signet is an Uncommon rarity card from the Commander Masters set in Magic: The Gathering, designated as #367. Valued at $5.00, it serves as a popular mana rock, providing significant utility in various Commander decks. Its consistent demand reflects its role in enhancing gameplay, making it a staple for collectors and players alike. The card's market presence remains stable, contributing to its desirability within the trading card community.