This is the mulligan rule from the Comprehensive rules:
*
103.4. A player who is dissatisfied with his or her initial hand may take a
mulligan. First, the starting player declares whether or not he or she will
take a mulligan. Then each other player in turn order does the same. Once
each player has made a declaration, all players who decided to take
mulligans do so at the same time. To take a mulligan, a player shuffles his
or her hand back into his or her library, then draws a new hand of one
fewer cards than he or she had before. If a player kept his or her hand of
cards, those cards become the player’s opening hand, and that player may
not take any further mulligans. This process is then repeated until no
player takes a mulligan. (Note that if a player’s hand size reaches zero
cards, that player must keep that hand.)*
When a player taakes a mulligan it doesn't matter how many mulligans he or
she has already performed, it only matters the amount of cards he had
before. So if a player takes a mulligan with 5 cards in his hand, he or she
will draw a new hand of 4 cards.
2013/3/5 Adam Zakreski <
forum-3208@apps.magicjudges.org>