I just bought that intro deck and was looking for a good way to revamp it. This looks like a solid way to start with it. Thanks!
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Something to add would be Disress (BB: Target player reveals his or hand. You choose a nonland card from it. That player discards that card.) Definitely more Magma Spray cards. Don't worry about bringing creatures back with this deck, just have more creatures that deal damage via tapping or when they die ( like Pitchburn Devils and Scuttling Doom Engine for example). Possibly take out Temple of Silence and replace with another basic land or Rakdos Guildgate or something similar.