4 of those are Maniacs.
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Exorcist? They're only about a buck.
Only two lotuses? Amateur.
Add atogs and flings.
Any megrim deck needs Zur's Weirding. If you can get ahead of them in life, you can just keep them from drawing again.
Crovax, Ascendant Hero or Porphyry Nodes might help as well. Since you're already running the Scourglass, the Nodes would be more efficient. If you're serious about the Mindslaver combo (and confident about the deck's mana production,) check out Bringer of the White Dawn. What's in the sideboard?