have u tried doing mono green infect.it should be waaay faster.or u can try my u/g infect http://www.mtgvault.com/vegeta/decks/budget-infect-mofo/
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awesome deck!!!built one like this but more budget friendly by abandoning inkmoth nexus and hinter land harbor but still works fine.it actually wins a lot more than i expected.feel free to check out mine and leave some comments maybe to help me improve my deck because i just started playing and don't really have any clue on how to build a deck of my own.help is much appreciated http://www.mtgvault.com/ViewDeck.aspx?DeckID=365346