Added Act of Treason to the sideboard. I've found it to be quite amusing to steal someone else's nasty creature to attack wih, then Fling it back at them. It isn't main deck because it does slow down how fast I can do damage, but gives me a creature removal combo with damage, albeit at 5 mana and 2 cards.
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I use to have Fling in the deck as a sort of "counter" to anti-creature spells and to Fling Kiln Fiends for minimum 4 damage (instant cast gives +3), but I felt Thunder Strike and Incinerate tended to work better for me as they tend to be useful in more situations. I'd rather keep my creatures for attacking/blocking than Flinging, but it does tend to be a good finisher. On that note, I would have Fling in my side deck in case I feel there is more need for it than, say, Thunder Strike. And if I can get the attack through with a Growthed Kiln Fiend with or without Tunneler (7 damage), I could follow it up with Fling for yet more damage (10 extra).