In Magic: The Gathering’s Commander format, a four-color deck utilizes cards from any combination of four out of the five colors of mana (white, blue, black, red, and green). This allows for a vast range of strategic possibilities, combining the strengths of multiple colors while mitigating some of their individual weaknesses. For example, a deck might combine the card draw of blue, the creature removal of black, the aggressive creatures of red, and the ramp potential of green.
Building with four colors presents unique challenges and rewards. Access to a broader card pool allows for greater deck customization and synergy. However, ensuring consistent access to the required mana can be difficult. Historically, four-color decks were less common due to these mana constraints, but the introduction of powerful four-color legendary creatures specifically designed for the Commander format has increased their viability and popularity.