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Now that I think about it, I'd throw out Flamekin Harbinger . She's good for snagging your Kiln Fiend s, but she's a costly 4-of where you want cheap instant / sorceries. Maybe a 2-of, but I'd take her out completely. Go to 4x Assault Strobe , and I'd recommend bringing back Distortion Strike , four of them. It's so powerful to have a buff for Kiln Fiend, and a card that makes sure it hits your opponents life. Instead of Serum Visions , I'd recommend Gitaxian Probe , because it has the option to be free, which could be extremely powerful early game if you're strapped for mana. For Spellskite , I might go down to three instead, maybe even two if you want to focus more on spells, your call there. It'll almost always cost you two life, but Mutagenic Growth is free, and your deck is so fast it doesn't really care about being a little suicidal, as long as your creatures are getting through. I'd also go up to 4x Delver of Secrets Flip , he's just so good, and he's usually unblockable for a few turns at least, making it a great target for Assault Strobe . I think 2x Isochron Scepter is fine, as again, you want to focus on as many spells as possible. I'd also go up to 4x Manamorphose . With all these changes, you might need to cut Spell Pierce and Vapor Snag but keep what you like and what plays well, since all these cards are relatively cheap. I'd take out Nivix, Aerie of the Firemind , the cost is just too expensive for the effect. Also might wanna do Sulfur Falls instead of the bluffs if you wanna save some cash. Take a look at Apostle's Blessing instead of Spellskite too, could be a better option, and way cheaper. Also, Sleight of Hand is really good and could be a 4-of with the right decklist.
Nowm with that out of the way, have you considered Distortion Strike to help push a lot of damage through? Adding Wee Dragonauts could also be useful, depending on your preference.I would cut Nivix, Aerie of the Firemind simply because it's more expensive than any of your spells.. And you're never guaranteed a spell, either.
I'd take out the delver, mostly because I hate the card and secondly because this is suppose to be aggro, not a slow grind.I know it works but takes the atention out of the kiln fiend strategy I think.I'd take it out and go for either 4 Ponder , or 4 of Preordain since it's a bit cheaper money wise.Also, I'd sideboard a set of Flaring Pain or a more verstile Mana Drain or Negate just to deal with possible Fog s from your opponent. Your Gitaxian Probe can see what is in your opponents hand, but it's helpful to be able to do something about it as well. Either that or a Fling or Soul's Fire (fling doesn't add +3/+0 to kiln fiend by the way)