The owner of this deck hasn't added a sideboard, they probably should...
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Good Slivers, obey me
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Umm . . . I'm no expert but I think it's spread a bit thin between the colors. Not to mention, you haven't got a single swamp to pay for those black cards that are in there. Good concept, horrible execution. If nothing else, make the deck bigger (a lot bigger) so that you have room for enough different lands.
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you don't need to make the deck bigger you need to sort your mana base - your never going to generate the colours you want from alll basic lands. you need things like reflecting pool, dual lands and tri colour lands.
magma sliver
Gemhide Sliver is there to help with the mana.