I like this deck, very focused, very simple. I recommend replacing the engines with "Sign in Blood" to speed up the deck.
Permalink
I think this deck is too "busy" and lacks focus. Reduce the artifacts and max out your infect creatures. I like "Sign in Blood" for infect decks, speed is important, you need to win before you stall at 8 or 9 poison counters, drawing extra cards will help and losing life isn't important when your goal is to infect.
Thanks man!
I suggest putting in Overwhelming Stampede for a finisher or Contagion Engine for another means of generating poison counters. I like the Birds and the Giant Growths, I think these really make the infect deck a threat.