Règles complètes de Magic: The Gathering

402.1.

The hand is where a player holds cards that have been drawn. Cards can be put into a player‘s hand by other effects as well. At the beginning of the game, each player draws a hand of seven cards. (See rule 103, «Starting the Game.»)

402.2.

Each player has a maximum hand size, which is normally seven cards. A player may have any number of cards in his or her hand, but as part of his or her cleanup step, the player must discard excess cards down to the maximum hand size.

402.3.

A player may arrange his or her hand in any convenient fashion and look at it as much as he or she wishes. A player can‘t look at the cards in another player‘s hand but may count those cards at any time.