Oh this is a sick deck. Perfect in every way.

Add Arcane Lighthouse for 33rd land.

Lim-Dul's Vault might be a worth addition.

Zareth San, the Trickster has potential.

I’d suggest switching a few black sources out for blue sources.

VampDemigod, you mean a couple less Swamps and more Islands?

I mean you could switch specifically basic lands if you want. I’m just observing that you have far more black cards in the deck than blue cards, yet you have more blue sources than black.

Peer into the Abyss + Psychic Corrosion could be a fun combo.

K'rrik, Son of Yawgmoth could be considered an ultimate ramp piece here.

Deck was lacking win cons, so I added the above Peer into the Corrosion combo as well as Personal Tutor.

Added more tutors and win cons to try to make this a turn 7 deck.

Grafted Identity is nice here.