Underworld Cerberus Is a great 5 drop, i would main board it and only put in Sire Of Insanity when playing against an esper or another form of control. Anger of the Gods is another card that should be in here for sure as well as Thoughtseize or Duress / +2 Hero's Downfall for sure and -1 Doomblade

As for sideboard +1 Slaughter Games and +3 Dark Betrayal

I love all of these suggestions Nekrocity.The only one I'm not sure about is Thoughtseize or Duress being mainboard. Both would be good to see someone's hand but I feel like those spots would be better filled with control spells. What is your take on this idea? what would you take out for them?I'm going to try to rework some of your other ideas in now. Thanks so much for the feedback!