A catalog of cards prohibited from use in sanctioned play within a collectible card game constitutes a restriction list. These cards, due to their potent effects or disruptive interactions, are deemed to negatively impact the competitive balance of the game. Such a list clarifies which cards are ineligible for inclusion in tournament decks, ensuring a more equitable and varied metagame. For instance, a card that allows a player to draw an excessive number of cards early in the game, creating an insurmountable advantage, might find itself on this list.
The existence of a restriction list provides multiple benefits. It prevents stagnation in the metagame, forcing players to explore new strategies and deck archetypes. It addresses unforeseen card interactions that arise after the initial release of a set, maintaining the intended design and gameplay experience. Historically, restriction lists have been employed in numerous card games to safeguard competitive integrity and promote a healthy and dynamic playing environment. This intervention ensures longevity and continued player engagement with the game.