When a player searches a library for cards, what happens to that library?

When a player searches a library for cards, the correct procedure involves shuffling the entire library, ensuring that the order of the cards is randomized. However, it's important to note that the cards that were searched for—those that were found—are not included in this shuffle. Instead, they are typically placed into the player's hand or onto the battlefield, depending on the effect of the search.

This method maintains the integrity of the game by ensuring other players cannot predict which cards will be drawn next and keeps the game dynamic. The act of shuffling the entire library, while excluding the found cards, maintains both the randomness required in gameplay and respects the vision of using search effects strategically.

The other options misrepresent the rules regarding how library searches function during a game. For example, simply shuffling only the found cards does not adhere to the standard library search mechanics outlined in the Comprehensive Rules. Understanding this aspect is crucial for interpreting the rules correctly during gameplay.