This deck would be pretty slow... Traumatize, Glimpse the Unthinkable Lore broker, Raven Guild Master are all good choices. I have no idea why you would want Naked Singularity in play at all when the only land you have are islands which produce green mana which is pretty much useless to you other than for artifacts.
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Add Saproling Symbiosis, check out my Saproling deck here http://www.mtgvault.com/viewdeck.php?did=3770