115. Mulligan Rule
Before each game begins, a player may, for any reason, reshuffle and redraw his or her hand, drawing one less card. This may be repeated as often as the player wishes, until he or she has no cards left in his or her hand.
The decision of whether to mulligan passes between players following the order established in section 113. After the participant who plays first mulligans as often as he or she likes, the decision of whether to mulligan passes to the other player. Once a player passes the opportunity to mulligan, that player may not change his or her mind.

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Magic: The Gathering, a player may declare a mulligan after drawing his initial hand at the beginning of each game. If such a declaration is made, the player puts his cards back into his deck, shuffles, and draws a new hand of the same number of cards minus one. A common reason for declaring a mulligan would be getting a hand with no mana sources, that is, a hand that has no playable cards. The player may repeat this until they are satisfied, or the number of cards in their hand reaches zero.

This mulligan style is known as the Paris mulligan, although it was first used in 1997 at the L.A. Pro Tour tournament as a test for the new system. It was mistakenly left in the Paris Pro Tour player's packet and this is where it finally got its name. Before that, the mulligan functioned differently. If a player had either 0 or 7 lands in his starting hand, that player could show his or her hand to the opponent, shuffle, and draw a new hand of seven cards. This was only allowed once. The new rule removed the requirement of revealing the hand to the opponent and made the mulligan a much more strategic part of the game, creating trade-off and risk where before there was none.