Yet that's the one that got an e-book while Innistrad got nothing.
What I remember of the things I read about it (since I myself didn't actually read it):
* Niv-Mizzet somehow got everyone to hold Wacky Races, complete with a starting line, instead of everyone trying to solve the maze secretly.
* Emmara is depicted with Voice of Resurgence's power.
* Emmara and Jace fall in rabu. (Later stories reveal Jace erased her memory of him afterward).
*
Melek is killed by Ral Zarek before it can actually do anything.
* All of the guild's maze runners arrive at the end around the same time, which causes a trap to trigger, casting Supreme Verdict unless everyone can work together. Lazav's master plan literally is to just shapeshift into people and start arguments, until everyone is arguing with each other and unable to do anything. Jace uses his mind powers to get everyone to understand each other, thus stopping the Supreme Verdict and turning him into Princess of Ravnica.