Is there a summary around or am I going to have to actually read something more than two paragraphs long?
Magic Story - Avacyn is Evil Now
* Avacyn has mostly been flying around around Innistrad doing random chores and such. She's kind of aloof and whatever and doesn't understand human emotion very much. She hears a prayer to save some kid who wandered off in the forest so she goes to save him. When she gets back she is struck with some kind of vision of "obelisks with runes carved on them." (they're not described as specifically looking like hedrons, but its from Avacyn's point of view, so they could just be those liths we've seen) She suddenly starts to notice people are kind of assholes and kids are pretty gross. She flies off thinking how shitty people are.
* Skips over to a story about a priest whose faith in Avacyn is wavering because he doesn't know if she's actually a god or worth worshipping. As a result, Avacyn herself shows up and he gets all happy but then she starts saying a bunch of threatening things to him about how she's lost faith in HIM; he pisses himself.
* Skips to a story about a werewolf whose curse was cured by the Cursemute. He's settled into a happy life as a blacksmith with his family now that the curse has abated. His house is oddly destroyed, but he mostly notices that his family keeps telling him not to answer the door. It turns out this is all in his mind and the curse came back and he murdered them all. He's super upset and an angel shows up and immediately murders him.
* Sigarda is floating around doing friendly angel shit when Bruna and Gisela show up, obviously having been converted to evil and apparently ready to fight Sigarda. Sigarda reminisces that Sigarda, Gisela and Bruna are all "sisters," but Avacyn was something else that just showed up one day. There was also a fourth "sister," (presumably a W/B one) that would often make alliances with demons and such; Avacyn apparently killed the fourth sister and banned mention of her name. Sigarda is regretful that she didn't stop Avacyn from killing the fourth sister. Avacyn herself shows up and starts spouting off about how humans are the real evil and if the angels kill them all the world would be pure. Sigarda thinks this is some wacky shit and starts preparing to fight Avacyn (even though she admits she's get wrecked in a fight with her). But instead Avacyn just tells Sigarda she'll one day be converted like Bruna and Gisela were and instead of fighting, blows up Sigarda's house and flies away. Sigarda is just like "well fuck" because she doesn't think anyone else is around that could realistically fight Avacyn.
* The woman who lost her child from the first story is looking for her child who got lost again when she notices that angels approach the village and are looking might evil today. She sends her kid into the woods again when Avacyn shows up and starts murdering everyone. She's pretty interested in murdering the kid too, but the woman sent it away. Story ends with Avacyn relishing the thought of murdering everyone.