The new mulligan rule in its entirety:
103.4. Each player draws a number of cards equal to his or her starting hand size, which is normally seven. (Some effects can modify a player’s starting hand size.) 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.) Then, beginning with the starting player and proceeding in turn order, any player whose opening hand has fewer cards than his or her starting hand size may scry 1.
That’s right all you fellow nerds the new mulligan rule is sticking and will be a new rule for all REL events starting at the Battle for Zendikar pre-release. This is exciting news for news for magic players and will help smooth out the one sided games we all love so much. The new rule was test at the last pro tour events with very positive results. So lets say good by to mana screw and one sided beat downs and play so card!