I may have stumbled onto something awesome

http://www.mtgvault.com/ViewDeck.aspx?DeckID=166392

I put this deck, a colorless one focused on proliferation spam, together out of idle curiousity So far, it has surpassed all my expectations. I've never been a noteworthy deckbuilder, but I like trying unconventional strategies. This costs maybe $75 to put together if you buy everything, and I'm sure there are better choices for some of the cards. Nonetheless, it's actually managed to hold it's own against most legacy decks at my local card shop. Does anyone have suggestions for more worthwhile things to proliferate, or other changes I should make? I want to keep it colorless, and don't have a ton of money to work with.