u dont really need horizon cobra for infinite mana, as soon as u have Crucible the Worlds, Zuran Orb and Fastbond out, u can simply destroy tapped lands and put them back into play untapped.
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Think about "living wish" and the eldrazis in side deck.. is allways a good thing :)
I allways like Bonesplitter in decks with Kor Duelist, second round 3/1 double strike is very nice!
Looks a bit like my deck. http://www.mtgvault.com/ViewDeck.aspx?DeckID=388681