Color Identity refers to the specific colors associated with a player's deck in the game of Magic: The Gathering. Each color represents different themes and mechanics, such as White for order and protection, Blue for knowledge and manipulation, Black for ambition and sacrifice, Red for chaos and passion, and Green for nature and growth. A deck's color identity is determined by the colors of the mana symbols in its cards. In Commander, a popular format of Magic: The Gathering, a player's color identity is crucial for deck-building. It dictates which cards can be included based on the colors of the chosen commander. For example, if a commander has a color identity of Blue and Black, the deck can only include cards that are Blue, Black, or colorless. This restriction encourages strategic planning and creativity in deck construction.