I'd say it's a pretty cool deck to play with, for sure. The creature are okay... but maybe 4x Liliana of the Veil is one too many... should have 3. I think this deck could benefit from Dark Ritual altough it wouldn't be modern anymore. Yoy could be dropping a 6/6 body by turn 2, or even turn 1 if you get two on the starting hand. If I wast to try them, I'd remove 1x Inquisition of Kozilek 1x Gatekeeper of Malakir 1x Liliana of the Veil and eventually 1x of the swords... but that just me.
Also Desecration Demon may interest you, as it forces the opponent to boost it to prevent the attack, and when there is nothing left to sacrifice... BOOM. +many/+many blow to the face, match.
Cheers!

@ Busse

I'd like to keep this Modern, so no Dark Ritual

Desecration Demon has come up before and has been rejected. The point of a 6/6 on turn 4 is to beat face, not give them an option.

sideboard Haunting Echoes . It's like a better Memoricide in late-game for one more mana.

Also I have a similar deck Humble Bundle Brutal Legend (Rock deck) only with green splashed in

2 in side might be optimal, but against what decks? UWx Control?

Everyone who isnt running land destruction has bad tron match ups because answering a turn 3 karn on the play is next to impossible. Your best bet is 1 mana discard in thoughtseize and Despise (inquisition is usless against tron). I'm more interested in how you handle control decks, most specifically, UWr control. Counterspells say no to everything (as per the point of the card), and you can't rely on also playing the slow game (to pay the 3 for Leaks and the like) because of a lower land count and the existence of Path to Exile and Sphinx's Revelation . I feel like thats definitely the worst match up. Obviously Turn 1 discard still does work, but I think maybe another whip in the board might be useful against them?

combo decks such as eggs

or manaless dredge, their graveyard will be gigantic and probably will have a copy of every card so u will probably deck them

also if I were u id switch Abyssal Persecutor with Desecration Demon