If you can afford it, having a few card:Rakdos's Return in here would really help I think. Even if you only play it for a small amount of mana, it is highly useful to have card advantage with a deck that runs lots of low drop creatures. Really the burn is just an added bonus. If you can use it for 5 mana, it makes them discard most, if not all, of their hand. That could be very good for you.
I will try to help you come up with a sideboard but it will take just a bit of time.