Arcane Signet is a popular artifact card in the trading card game Magic: The Gathering. It costs one generic mana to cast and provides one mana of any color in your commander's color identity when tapped. This makes it a versatile tool for players, especially in Commander format, where mana management is crucial. The card is often included in decks to enhance mana efficiency and support various strategies. By generating additional mana, players can cast more powerful spells or activate abilities more frequently, helping them gain an advantage in gameplay.