This deck looks nice. I would replace Smoldering Marsh with Foreboding Ruins, since you need red mana in the early turns of the game, and Foreboding Ruins triggers off the basis Mountains and Swamps in addition to Sunken Hollow. Distended Mindbender is a great sideboard card against slower control decks. Other cards you could consider are Insolent Neonate, Fiery Temper, Key to the City, Sinister Concoction. Perpetual Timepiece is also an interesting card if you find yourself needing some mill engines.

Thanks for the input!

I'm hesitant to put in Foreboding Ruins, only because I don't have many lands to trigger it consistently, but I will have to playtest it. I've tried some of the other cards you mentioned and I'm trying to put my own spin on some of the Grixis Emerge decks I see floating around. I will definitely try some of them out.