I have a few questions about this deck.
What exactly is the point of having
Volrath's Laboratory in the deck when you could just put in another sliver that has a static ability? Similarly, why
Heartstone? Slivers rarely have activated abilities that cost mana.
There are also some creatures in the deck that are questionable, and could be replaced with some decent Slivers; for instance:
Universal Automaton,
Metallic Sliver,
Irregular Cohort, and
Thunderfoot Baloth.
I can understand creatures like
Unsettled Mariner, as he has an ability that benefits slivers, and can be affected by the effects that affect slivers, but the 4 I mentioned above don't really seem to belong.