Izzet Guildgate

This land enters tapped.
{T}: Add {U} or {R}.

Essence Sliver

Whenever a Sliver deals damage, its controller gains that much life.

Coat of Arms

Each creature gets +1/+1 for each other creature on the battlefield that shares at least one creature type with it. (For example, if two Goblin Warriors and a Goblin Shaman are on the battlefield, each gets +2/+2.)

Basal Sliver

All Slivers have "Sacrifice this permanent: Add {B}{B}."

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.

Heartstone

Activated abilities of creatures cost {1} less to activate. This effect can't reduce the mana in that cost to less than one mana.

Sliver Queen

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

Dimir Guildgate

This land enters tapped.
{T}: Add {U} or {B}.

Gemhide Sliver

All Slivers have "{T}: Add one mana of any color."

Bonescythe Sliver

Sliver creatures you control have double strike. (They deal both first-strike and regular combat damage.)

Crystalline Sliver

All Slivers have shroud. (They can't be the targets of spells or abilities.)

Blur Sliver

Sliver creatures you control have haste. (They can attack and {T} as soon as they come under your control.)

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.)

Gateway Plaza

Gateway Plaza enters tapped.
When Gateway Plaza enters, sacrifice it unless you pay {1}.
{T}: Add one mana of any color.

Hollowhead Sliver

Sliver creatures you control have "{T}, Discard a card: Draw a card."

Clot Sliver

All Slivers have "{2}: Regenerate this permanent."

Simic Guildgate

This land enters tapped.
{T}: Add {G} or {U}.

Gruul Guildgate

This land enters tapped.
{T}: Add {R} or {G}.

Rakdos Guildgate

This land enters tapped.
{T}: Add {B} or {R}.

Sliver Hivelord

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

Forest

Lavabelly Sliver

Sliver creatures you control have "When this creature enters, it deals 1 damage to target player or planeswalker and you gain 1 life."

Orzhov Guildgate

This land enters tapped.
{T}: Add {W} or {B}.

Recycle

Skip your draw step.
Whenever you play a card, draw a card.
Your maximum hand size is two.

Brood Sliver

Whenever a Sliver deals combat damage to a player, its controller may create a 1/1 colorless Sliver creature token.

Aluren

Any player may cast creature spells with mana value 3 or less without paying their mana costs and as though they had flash.

Selesnya Guildgate

This land enters tapped.
{T}: Add {G} or {W}.

Synchronous Sliver

Muscle Sliver

Horned Sliver

Golgari Guildgate

This land enters tapped.
{T}: Add {B} or {G}.

Cloudshredder Sliver

Sliver creatures you control have flying and haste.

Sliver Legion

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

Boros Guildgate

This land enters tapped.
{T}: Add {R} or {W}.

Hunter Sliver

All Sliver creatures have provoke. (Whenever a Sliver attacks, its controller may have target creature defending player controls untap and block it if able.)