In “Limited” tournaments, players construct decks using booster packs plus any additional basic lands of their choice. The decks in Limited tournaments must be a minimum of forty cards. All unused cards function as the sideboard. In contrast to “Constructed” tournaments, the player is not restricted to exchange cards on a one-for-one basis when sideboarding, so long as the player adheres to the forty card minimum. The rule that a player may use only four copies of any given card does not apply.