Selesnya Guildgate

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

Forest

Rakdos Guildgate

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

Spinning Wheel

{T}: Add one mana of any color.
{5}, {T}: Tap target creature.

Dementia Sliver

All Slivers have "{T}: Choose a card name. Target opponent reveals a card at random from their hand. If that card has the chosen name, that player discards it. Activate only during your turn."

Golgari Guildgate

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

Gemhide Sliver

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

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.

Island

Muscle Sliver

Gruul Guildgate

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

Clot Sliver

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

Izzet Guildgate

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

Opaline Sliver

All Slivers have "Whenever this permanent becomes the target of a spell an opponent controls, you may draw a card."

Spinneret Sliver

Sliver Legion

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

Virulent Sliver

All Sliver creatures have poisonous 1. (Whenever a Sliver deals combat damage to a player, that player gets a poison counter. A player with ten or more poison counters loses the game.)

Dimir Guildgate

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

Spiteful Sliver

Sliver creatures you control have "Whenever this creature is dealt damage, it deals that much damage to target player or planeswalker."

First Sliver's Chosen

Sliver creatures you control have exalted. (Whenever a creature you control attacks alone, it gets +1/+1 until end of turn for each instance of exalted among permanents you control.)

Harmonic Sliver

All Slivers have "When this permanent enters, destroy target artifact or enchantment."

Two-Headed Sliver

All Sliver creatures have menace. (They can't be blocked except by two or more creatures.)

Predatory Sliver

Poultice Sliver

All Slivers have "{2}, {T}: Regenerate target Sliver." (The next time that Sliver would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Quilled Sliver

All Slivers have "{T}: This permanent deals 1 damage to target attacking or blocking creature."

Sliver Queen

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

Sidewinder Sliver

All Sliver creatures have flanking. (Whenever a creature without flanking blocks a Sliver, the blocking creature gets -1/-1 until end of turn.)

Telekinetic Sliver

All Slivers have "{T}: Tap target permanent."

Mountain

Azorius Guildgate

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

Frenetic Sliver

All Slivers have "{0}: If this permanent is on the battlefield, flip a coin. If you win the flip, exile this permanent and return it to the battlefield under its owner's control at the beginning of the next end step. If you lose the flip, sacrifice it."

Simic Guildgate

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

Swamp

Watcher Sliver

Cloudshredder Sliver

Sliver creatures you control have flying and haste.

Manaweft Sliver

Sliver creatures you control have "{T}: Add one mana of any color."

Terramorphic Expanse

{T}, Sacrifice Terramorphic Expanse: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Evolving Wilds

{T}, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Shifting Sliver

Slivers can't be blocked except by Slivers.

Basal Sliver

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

Shadow Sliver

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

Firewake Sliver

All Sliver creatures have haste.
All Slivers have "{1}, Sacrifice this permanent: Target Sliver creature gets +2/+2 until end of turn."

Hibernation Sliver

All Slivers have "Pay 2 life: Return this permanent to its owner's hand."

Homing Sliver

Each Sliver card in each player's hand has slivercycling {3}.
Slivercycling {3} ({3}, Discard this card: Search your library for a Sliver card, reveal it, put it into your hand, then shuffle.)

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.)

Dormant Sliver

All Sliver creatures have defender.
All Slivers have "When this permanent enters, draw a card."

Boros Guildgate

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

Cleaving Sliver

Necrotic Sliver

All Slivers have "{3}, Sacrifice this permanent: Destroy target permanent."

Orzhov Guildgate

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

Plains

Battering Sliver

Fury Sliver

Mindlash Sliver

All Slivers have "{1}, Sacrifice this permanent: Each player discards a card."

Cultivator's Caravan

{T}: Add one mana of any color.
Crew 3 (Tap any number of creatures you control with total power 3 or more: This Vehicle becomes an artifact creature until end of turn.)