you could always put in some generic ones, such as evolving wilds or teramorphic expanse. they arent as good (only one use and they are dead) but they would work.
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you seem to have a bit of landfall in there... with poison and landfall combination, adventuring gear works well, especially if you throw in some fetchlands (which will help you get out various kinds of land, if you are mana screwed), because it says each time a land enters the battlefield, equipped creature gets +2/+2. the problem with fetchlands (in this deck, at least) is that you arent running any straight mountains, and they require you to get basic lands. i would say maybe take out one of your copperline gorges and one blackcleave cliff and put in two mountains, then switch out two to four of your other lands (doesnt matter what) for some sort of fetchland.
maybe add in jaces erasure? for each card you draw, they mill one. its like the opposite of chains of mephistopheles.
*closest ive gotten thematically to this
lol this deck is.... really freaking awesome. i am jealous of your deck making skills. lol the closest to this that ive gotten is this: http://www.mtgvault.com/ViewDeck.aspx?DeckID=126907 (why yes, this is a shameless attempt to get other people looking at my decks).
note: you said the color was white, but its actually black. lol
dude, you might consider adding a bit of blue in here, so you can add in inexorable tide and steady progress. both are fantastic in my arcbound prolif deck (http://mtgvault.com/ViewDeck.aspx?DeckID=122269 is an older version of it), though more inexorable tide than steady progress. not sure if thatd really help all that much, cuz youd have to worry about getting both types of mana. maybe add in some jwar island refuges to help with that, or a similar land?