Sliver EDH

Okay, so a friend of mine is getting out of Magic and sold me this deck (along with like 8 Planechase cards) for $50. I made out, but this is definitely an odd build so I am looking for help making this deck better. I have done some tweaking, but it more needs to be done. Thanks.

Commander: {Sliver Overlord}

Sorcery (5)

1x {Aphetto Dredging}
1x {Cultivate}
1x {Farseek}
1x {Living Death}
1x {Sylvan Scrying}

Instant (3)

1x {Doom Blade}
1x {Hero's Demise}
1x {Putrefy}

Enchantment (5)

1x {Descendants' Path}
1x {Soothsaying}
1x {Training Grounds}
1x {Unnatural Selection}
1x {Wild Pair}

Creature (42)

1x {Acidic Sliver}
1x {Bonescythe Sliver}
1x {Bonesplitter Sliver}
1x {Brood Sliver}
1x {Clot Sliver}
1x {Crystalline Sliver}
1x {Essence Sliver}
1x {Firewake Sliver}
1x {Fungus Sliver}
1x {Galerider Sliver}
1x {Gemhide Sliver}
1x {Harmonic Sliver}
1x {Heart Sliver}
1x {Hibernation Sliver}
1x {Homing Sliver}
1x {Hunter Sliver}
1x {Lymph Sliver}
1x {Magma Sliver}
1x {Manaweft Sliver}
1x {Megantic Sliver}
1x {Might Sliver}
1x {Muscle Sliver}
1x {Necrotic Sliver}
1x {Predatory Sliver}
1x {Quick Sliver}
1x {Quilled Sliver}
1x {Sentinel Sliver}
1x {Shadow Sliver}
1x {Shifting Sliver}
1x {Opaline Sliver}
1x {Sliver Overlord}
1x {Spectral Sliver}
1x {Spinneret Sliver}
1x {Striking Sliver}
1x {Syphon Sliver}
1x {Telekinetic Sliver}
1x {Thorncaster Sliver}
1x {Toxin Sliver}
1x {Two-Headed Sliver}
1x {Victual Sliver}
1x {Ward Sliver}
1x {Winged Sliver}

Land (38)

1x {Akoum Refuge}
1x {Ancient Ziggurat}
1x {Coastal Tower}
1x {Dragonskull Summit}
1x {Elfhame Palace}
1x {Evolving Wilds}
3x {Forest}
1x {Gemstone Mine}
1x {Golgari Guildgate}
1x {Grand Coliseum}
1x {Graypelt Refuge}
1x {Halimar Depths}
3x {Island}
1x {Izzet Guildgate}
1x {Jwar Isle Refuge}
1x {Karplusan Forest}
1x {Kazandu Refuge}
2x {Mountain}
1x {Orzhov Guildgate}
2x {Plains}
1x {Rupture Spire}
1x {Salt Marsh}
1x {Savage Lands}
1x {Sejiri Refuge}
1x {Selesnya Guildgate}
1x {Shivan Oasis}
1x {Swamp}
1x {Terramorphic Expanse}
1x {Urborg Volcano}
1x {Vivid Creek}
1x {Vivid Grove}
1x {Vivid Marsh}

Artifact (7)

1x {Coat of Arms}
1x {Cryptic Gateway}
1x {Darksteel Ingot}
1x {Door of Destinies}
1x {Door to Nothingness}
1x {Lotus Petal}
1x {Prophetic Prism}