YES!!!!! That was good! More game logs than usual, though still not as many as I would like (and they are pretty in-depth, so I'm giving JVL a break there), it's a deck we see a lot of, but with some non-intuitive choices, and overall it was very good. Also, the fact he went 2-1 against Caw-go with a rareless deck means we may see more. Tournament compeititive is fine as a standard for budget, but we still need a budget. One of the main arguments against something more constricting is that it wouldn't work. But here we have proof that it can! One suggestion: Don't be to concerned with making it entirely rare-free. I think I speak for all of us complainers when I say we'd be fine with budget rares, especially if they're absolutely necessary to the deck. We've just thought you've been going overboard recently.
I've been tying around with a similar deck, and Calcite Snapper is a really good addition. Your burn keeps the board clear and the 4 point beat is really nice. He also blocks nicely against some of the better ground pounders in the format. The only problem is that with him and the Commando together, the deck needs to be a little more heavy on the blue.
If you really wanted to jazz this deck up with a couple bucks, Slagstorm could be a good addition, especially if you decide to get in on the Convertible Turtle action. The spell doubles as an emergency board sweeper against very fast Aggro like Kuldotha, and can even be used as extra face burn, which is especially nice paired with Kiln Fiend.
This deck looks like a lot of fun. The fact that it told CawBlade to shut up for at least one game means it has some validity. But I think putting more Shroud guys into the mix will just make opponents reach for more mass removal in the sideboard; Pyroclasm being treated like spot removal is a bit of a humorous prospect. However, I really do suggest this for the Avenger of Zendikar matchup: Chain Reaction. If he makes enough plants, blow his funky butt out of the sky with this on color and very relevant Day of Judgment clone. It may just be necessary.
I'd also suggest maybe a package of Chandra's Spitfire to hammer in the damage, but it really contends with that 3-drop spot held by both Aether Adept and the Commando. You know although this is strictly a rareless build, I'm inclined to suggest using Chandra herself; she does play the role of crowd control in this era dominated by weenies holding swords. But that would put a 5 mana spike in your curve; likewise Koth wouldn't help you much since this isn't mono red, but he'd still be able to Vengevine one of your mountains, and they'd have to choose between 4 damage and 2+ card advantage for you.
Otherwise, you could put Distortion Strike in the sideboard because it's just so good with Fiend.
All in all, the most ridiculously fun budget deck I've had the pleasure of reading about in a while.
I know it breaks the "no rare" rule, but it still seems like a terrible idea to have Neurok Commando in there when things like Surrakar Spellblade exist. Maybe the Shroud actually helps sometimes, but if you're planning on clearing the way for your guys with that much burn, the Spellblade would draw you a fistful of cards whenever it hits. Plus, it's actually cheaper than some of the commons in the deck *cough*Lightning Bolt *cough*.