DESCRIPTION
This deck uses Sinew and Might Slivers to increase the toughness of my Slivers so that they can survive Psionic Sliver's effect. Add in Fungus Slivers for continuous buffs from Psionic's effect, and they'll either attack or blast the opposition to dust.
As for the sideboard, I've got a couple of black mana sources, as there are none in the mainboard save vivids and reflecting pools. This supports Ghostflame Slivers to counter Oona, and Necrotic Slivers to handle things that can survive my Psionic Slivers. Harmonic and extra Spinnerets handle Bitterblossom, and Primal takes care of Reveillark (hopefully).