Running 24 lands, I don't think running Nykthos is needed, especially since your curve only goes to 5 and you have Crypt Ghasts :)

Honestly this will sound embarrassing but I forgot they ramp mana too. XD

I agree, take your lands down to maybe add some other specters or I like small stuff, Ravenous Rats is fun and cheap. Or Waste Not is fun too.

Or if you plan just on being defensive until you can get a combo up Typhoid Rats is fine. Though Waste Not is really good if you push your discard further (: maybe add some tutors to help you find combo pieces though?

Tutors are above my pay grade (well everything that's not diabolic). I was thinking of adding Greed too for more draw.

If you want more draw try Howling Mine, this will help. +1 for a good idea.

Why not run Diabolic Revelation instead so you can get both pieces at once?

And maybe Blood Seeker to win those multiplayer games

I love running my Zendikar vampire deck with a playset of blood seekers and Butcher of Malakirs just to make everyone mad.

I'll definitely grab a couple of those revelations, the only problem is how much it costs. Kinda slows down my 4-5 turn win.