You shouldn't habe published this yet, it clearly isn't finished and abyssal scpeter isn't good on AP mid for only the MR reduction due to the nerf.
Masteries what's wit the 1 point on spellvamp instead of Runic Affinity ?

not so much aggressive with so much defensive items. also the guide could have been longer but it's otherwise okay

Abyssal isn't good at all on cass, they nerfed the range....so she can't range poke...and haunting is iffy, I prefer catalyst instead of it for mana.