3 Disrupting Scepter (? this slot is questionable, it could be a good follow up to turn 2 Castigate against control decks)
If it is only good against control decks then it should be a sideboard slot. I do think however that you should just cut it alltogether. Persecute would work better I think and combines nicely with Castigate. It will feel more like Solar Flare's ability to attack permanents and hand.
Why run Disenchant over Mortify in the maindeck. With Jitte and Tatsumasa gone, what artifact is so important that you will need an immediate answer? Mortify does the job just as well against powerhouse enchantments like Glare and Knell.
Have you tried switching Cruel Edict for Sudden Death? The only creature you can't kill with it is Simic Sky Swallower so I think it is a more relevant answer in the maindeck.
I've counted 12 potential answers in your deck against an Akroma, so I suggest you don't worry about her too much.