BW Sliver deck, any ideas?

[xfaithlessishe]

I've built a pretty kick ass BW sliver deck, but i think i need to get rid of some cards.
so anything you think could go, please say so.

also:  if you can suggest any cards that would make it more powerful. feel free to do so. Thank you!

CREATURES
(black)
1x Toxin Sliver
1x Magus of the Mirror (in case im getting bludgeoned.)
1x Cairn Wanderer (changeling)
2x Frenzy Sliver
3x Crypt Sliver     
(white)
1x Elspeth, Knight-Errant
1x Essence Sliver
2x Pulmonic Sliver
2x Ward Sliver
2x Plated Sliver
4x Sinew Sliver
2x Sidewinder Sliver
2x Talon Sliver
1x Quilled Sliver
3x Avian Changeling

Sorcery
(black)
2x Soul Reap
(white)
1x Heroes Remembered

Instant
(black)
1x Darkness
1x Dark Banishing
1x Pack's Disdain
1x Footbottom Feast.
1x Unmake
(white)
1x Strip Bare

Enchantment
(black)
1x Dark Suspicions
1x Fear
(white)
1x Boon Reflection
2x Serra's Blessing
1x Parallax Wave

Artifacts
2x Dolmen Gate
1x Sculpting Steel
1x Ward of Bones
1x Akroma's Memorial

LAND
4x Orzhov Basilica
11x Swamp
12x Plains

Thank you!