New mulligan rule goes into effect worldwide

Wizards announced, that a new mulligan rule, which was tested at Pro Tour Vancouver, received a lot of positive feedback and starting with the Battle for Zendikar Prereleases the change goes into effect worldwide, including Magic Online. Simly put, any player whose opening hand has fewer cards than his or her starting hand size may scry 1. 

Basing on ChannelFireball calculation, the players mulliganing to 5 probably won something like 30% of the time and even a mulligan to 6 might drop your chances of win to around 38%. These figures would of course vary by format and by mulligan skill level, but the size of the effects were large everywhere. Mulliganing was very costly. Indeed, it still is, but your chances of winning the game are a little bit higher now.