The Rule of Four is a fundamental principle in many card games that governs deck-building and game balance. This rule stipulates that players can include no more than four copies of any individual card in their deck. The intent behind this rule is to maintain a balanced and strategic gameplay environment by preventing any single card from becoming too dominant or overly repetitive.

• Purpose and Impact
  
  
  1. Game Balance: The Rule of Four ensures that no single card can overwhelm the game’s dynamics. By limiting the number of copies a player can include, the rule helps to promote a diverse range of strategies and prevents players from relying too heavily on a single card to win.
     
     
  2. Deck Variety: This rule encourages players to build more varied and interesting decks. With only four copies allowed, players must carefully choose which cards to include, leading to more thoughtful deck construction and strategic planning.
     
     
  3. Competitive Fairness: In competitive play, the Rule of Four helps to level the playing field. It ensures that all players have access to the same opportunities and constraints, which contributes to fairer and more engaging matches.