Venom Sliver

Sliver creatures you control have deathtouch. (Any amount of damage a creature with deathtouch deals to a creature is enough to destroy it.)

Sliver Hivelord

Sliver creatures you control have indestructible. (Damage and effects that say "destroy" don't destroy them.)

Dragon Arch

{2}, {T}: You may put a multicolored creature card from your hand onto the battlefield.

Metallic Sliver

Forest

Sliver Legion

All Sliver creatures get +1/+1 for each other Sliver on the battlefield.

The First Sliver

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)
Sliver spells you cast have cascade.

Sliver Queen

{2}: Create a 1/1 colorless Sliver creature token.

Island

Sliver Hive

{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to cast a Sliver spell.
{5}, {T}: Create a 1/1 colorless Sliver creature token. Activate only if you control a Sliver.

Shifting Sliver

Slivers can't be blocked except by Slivers.

Sliver Overlord

{3}: Search your library for a Sliver card, reveal that card, put it into your hand, then shuffle.
{3}: Gain control of target Sliver. (This effect lasts indefinitely.)

Galerider Sliver

Sliver creatures you control have flying.

Screeching Sliver

All Slivers have "{T}: Target player mills a card."

Shadow Sliver

All Sliver creatures have shadow. (They can block or be blocked by only creatures with shadow.)