I would recommend removing All of the Nightveil Specters and replacing it with Wight of Precinct Six. The specters are removing cards from the graveyard while most of your other cards are working off of your opponents graveyard. You should get more deck synergy this way.

cool deck! i like the Evil Twin . i feel like you could make him more prominent. especially coupled with a Keymaster Rogue . and some unsummons. bounce theirs, or bounce the Evil Twin , copy the other creature, and destroy it.

Actually, the main reason I use Evil Twin is to copy either my own Consuming Aberration or Crypt Ghast , but doubles as janky removal if necessary.