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New cards to boost the deck! old deck: http://www.mtgvault.com/ViewDeck.aspx?DeckID=26219 Goal Deck: http://www.mtgvault.com/ViewDeck.aspx?DeckID=26210
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if it were me i woudl try to make this deck a but more focused. that is, i would try to take some of the slivers that i found to have the best abilities and put more of them in the deck, while taking out others that were less useful. also, brood sliver, essence sliver, and toxin sliver are all very good cards as well.
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i would out in sliver overlord as well. Its a 7/7 for 5 with nasty sliver abilities. Costs some money but should be worth it. I also second CALamity's suggestion for adding brood essence and toxin sliver. Another extrememly friggin awesome one is magma sliver. That's my personal favorite. Once you get your slivers unblockable somehow its total carnage!!!!
I have a sliver deck too, but don't use as many as you, so I agree with both guys and think you might want to try and make it more focused, my personal favorite is chrystalline sliver. Also you only have 59 cards