Definitely liking the new version better. Cards to consider over Hover Barrier:

Drift of Phantasms

Fog Bank

Kaijin of the Vanishing Touch

Fog Bank was already on my radar, but the other suggestions I never knew about. I will definitely consider them when it's time to update. Thank you!

Some popular game enders have been Haunting Echoes + Traumatize . Which I see you already have you already have the Haunting Echoes. Also Mirko Vosk, Mind Drinker can also do some work in casual gaming, Nihilith gets there pretty quickly. Duskmantle Guildmage + Mindcrank can be infinite.

So, overall, I like the build, but, if you're willing to dive into grixis a little more, you could add in stuff like Kederekt Creeper or Stuffy Doll, or AEther Membrane. Kederekt Creeper is better against a control deck that needs all of it's creatures. Stuffy Doll is hilarious against decks that run a big threat, or deathtouch, since it shoves damage back at your opponent and is indestructible. Again, sliding more into grixis is stuff like Heat Ray, which you can bracket Stuffy Doll with to threaten your opponent's life. AEther Membrane is better than Hover Barrier, because it will get rid of annoying creatures, and destroy tokens. You should also consider a boardwipe or two, Damnation would do the trick. Also, to divert attention from your life, you could add a planeswalker such as Jace, Memory Adept. This Jace also can WRECK someone else's deck with his 0, or you can use his +1 as a repeatable Thought Scour. Other than that, you could us an Ulamog, the Ceaseless Hunger as a late game threat. Love the deck though. I'll be trying to copy (and re-adapt it to my style). +1

Thank you for the detailed suggestions. This is a work in progress at the moment as I'm trying to improve the deck overall while keeping it within the Modern format. I love some of the suggestions and plan to playtest them to see how I like them. I like the idea of adding red as it can make the deck more unpredictable as well as add new elements to it. Stuffy Doll is a favorite card of mine that I have failed to put into a dcek anywhere at this point. I would like everyone's feedback on this more concentrated Dimir Mill deck, which is an update for this one that I've been sitting on for a while. Let me know what you think. And the description on it isnt as detailed, it's just notes I was typing in as I would make changes.http://tappedout.net/mtg-decks/thought-hemorrhage-v-15/

You can also try Sphinx's Tutelage in combination with Thought Scour and Visions of Beyond. Just in case, maybe you already know it =)

Thank you for the tip. I had not considered that angle before. It may be useful with something like Monastery Siege to allow a continuous draw engine.

Yahenni's Expertise combo's with every card in your deck aside from Archive Trap. Most notable combos:

• Breaking / Entering casts both sides of the card.

• Crypt Incursion kill a bunch of threats and then immediately regain lost life.

• Mind Funeral

It could potentially replace Ensnaring Bridge on the main board. You could always move the bridge to the sideboard as well.

Warrants some play testing. You're welcome.