Nice. Have you looked into the Mindcrank combo? It's U/B and is rather quick. Plus a lot of the cards can be traded for pretty easily.
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It can certainly find a place in pretty much all modern decks I think, besides storm maybe. There are always alternatives to Spellskite, such as Apostle's Blessing. The only thing about playing grudge is that you'll probably want a one of Breeding Pool and/or Stomping Ground in the maindeck for the flashback cost.
Have you ever thought about adding some Ancient Grudges or Spellskites to the sideboard? Grudge destroys Pithing Needles which shut down the combo and Spellskite helps to protect your Nettle Drone.Also, Tolaria West may be a good addition in the maindeck as it will allow you to transmute for one of the 0 cost artifacts the combo needs. A set of Tarns may be good as well since they can help you thin out your deck and get to the combo pieces faster.