I appreciate trying to come up with an original decklist, but I don't see some of these cards being main board... Blood seeker is a sideboard card at best (aggro). I have issues with Lacerater so i would recommend replacing the Blood Seekers with Pulse Tracker. You want to focus on keeping mana open for Kalastria so i would recommend replacing Feast of Blood with Disfigure, it allows you to maintain open mana while still gaining the advantage in the early game and you already have things like Ascension Kalastria, and Nighthawk for life gain. As for Doomblade I would recommend replacing it with Go for the Throat, because there are very few artifact creatures in the metagame at present. Bloodghast is too good of a card to not have 4 of so try to work the last one in... -1 Hexmage maybe?. I like original builds, but you want to be sure that you aren't doing it at the expense of using the best cards for the deck. A lot of those cards that "everyone uses" are used for a reason... they've been thoroughly playtested by pros. Just something to keep in mind.
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You can tutor it up with Fauna Shaman when you need it. Take a look at most standard elf decks. they run one scout.
Boros scares me more and more with every set. Nice deck list. I'm thinking we might see something similar to this in the metagame pretty soon. http://mtgvault.com/ViewDeck.aspx?DeckID=152824
but very good concept... i have one thats similar... although its not posted on this site
get rid of the vanquishers and add 2 nissa and either 2 more overwhelming stampedes or 2 taunting elves