With such a huge update bugs are expected. So until this bug is fixed I highly recommend you don't play Oracle as this bug makes your strongest spell not work during False Promise. This is currently the only ability in the game that gives 100% magic resistance so it not working at all makes Oracle a really bad hero. This is why his winrate dropped by 8% in the past few days even though he only got buffs from the last patch.
![](https://i.ytimg.com/vi/Kl-jmaggG9w/maxresdefault.jpg)