Cards I have and should add but are in other decks:
Hall of the Bandit Lord
Darksteel Plate

Consider:
More card draw that is card positive
Board wipes
More Mairsil ETB triggers (blinking)

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Possible additions:

+1/+1 counters:
Clockwork Dragon?
Academy Elite?
Sage of Hours
Anthroplasm
Simic Manipulator
Sage of Fables
Crystalline Crawler
Phyrexian Devourer?
Walking Ballista
Sphinx of Magosi

Charge counters:
Astral Cornucopia
Spawning Pit
Otherworld Atlas?
Grindclock?

Other abilities:
Trading Post?
Jalira, Master Polymorphist?
Oona, Queen of the Fae
Mindshrieker
Pearl Lake Ancient
Boompile
Pack Rat
Burnished Hart
Mirror-Mad Phantasm - Self-mill + Mairsil protection
Burnished Hart
Psychatog
Mortivore

Augments:
Hammer of Purphoros
Training Grounds

Spells:
Steam Augury?
Life's Finale
Crux of Fate
Necromancer's Stockpile
Essence Flux

Lands:
Command Beacon
Desolate Lighthouse

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Need:
Morphling
Thousand-Year Elixir
Illusionist's Bracers
Eater of the Dead
Knacksaw Clique
Dralnu, Lich Lord
Patron of the Moon
Jodah's Avenger
Spikeshot Elder
Cinderhaze Wretch

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Cuts:
Crosis's Charm
Necromantic Selection
Nivix Guildmage
Portal Mage
Puppeteer Clique
Etherium-Horn Sorcerer
Opportunity
Bloodline Necromancer
Serendib Sorcerer
Harbinger of the Tides
Polymorphist's Jest
Curse of Verbosity
Apprentice Necromancer
Inalla, Archmage Ritualist
Shifting Shadow
Taigam, Sidisi's Hand
Silumgar's Command
Nin, the Pain Artist
Worn Powerstone
Unstable Obelisk
Go for the Throat
Izzet Chronarch
Terminate
Niv-Mizzet, the Firemind
Archaeomancer
Darksteel Ingot
Merchant of Secrets
Sea-Gate Oracle
Body Double
Shadowmage Infiltrator

7x Island
5x Swamp
3x Mountain
Vivid Marsh
Vivid Creek
Vivid Crag
Temple of the False God