General Rulings - 401

• 401.1 - When a game begins, each player's deck becomes his or her library. [CompRules 2009/07/08]
• 401.2 - Each library must be kept in a single face-down pile. Players can't look at or change the order of cards in a library. [CompRules 2009/07/08]
• 401.3 - Any player may count the number of cards remaining in any player's library at any time. [CompRules 2009/07/08]
• 401.4 - If an effect puts two or more cards on the top or bottom of a library at the same time, the owner of those cards may arrange them in any order. That library's owner doesn't reveal the order in which the cards go into his or her library. [CompRules 2009/07/08]
• 401.5 - If a spell or ability causes a card to be drawn while another spell is being cast, the drawn card is kept face down until that spell becomes cast (see Rule 601.2h). The same is true with relation to another ability being activated. [CompRules 2009/07/08]
• 401.6 - Some effects tell a player to play with the top card of his or her library revealed, or say that a player may look at the top card of his or her library. If the top card of the player's library changes while a spell is being cast, the new top card won't be revealed and can't be looked at until the spell becomes cast (see Rule 601.2). The same is true with relation to an ability being activated. [CompRules 2009/10/01]
• 401.7 - If an effect causes a player to play with the top card of his or her library revealed, and that particular card stops being revealed for any length of time before being revealed again, it becomes a new object. [CompRules 2009/07/08]