Unburial Rites
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Consider -2 Tezzeret's Gambit in favor of +1 Preordain. You lose two potential 'colorless' draws for two hard-blue draws, but if you're looking for speed, more preordain could ensure you get a card that you want, or more importantly, allow you to not draw two cards that you don't want; not to mention they're at least two colorless cheaper and you have other ways to proliferate. -1 Tumble Magnet and +2 Prophetic Prism to prevent any dead card scenarios. (I know you have the 'Birds but there's always a chance that you don't open with a Forest, so the Prisms might be a good backup plan) Good Luck! Check out my Proliferate / Infect deck if you have a minute: http://www.mtgvault.com/ViewDeck.aspx?DeckID=185905