Counterspell

Bonesplitter Sliver

Forest

Gemhide Sliver

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

Sinew Sliver

Sentinel Sliver

Sliver creatures you control have vigilance. (Attacking doesn't cause them to tap.)

Sulfurous Mire

({T}: Add {B} or {R}.)
Sulfurous Mire enters tapped.

Horned Sliver

Faithless Looting

Draw two cards, then discard two cards.
Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Shadow Sliver

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

Mountain

Swamp

Predatory Sliver

Island

Exhume

Each player puts a creature card from their graveyard onto the battlefield.

Winding Way

Choose creature or land. Reveal the top four cards of your library. Put all cards of the chosen type revealed this way into your hand and the rest into your graveyard.

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.)

Ponder

Look at the top three cards of your library, then put them back in any order. You may shuffle.
Draw a card.

Blur Sliver

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

Woodland Chasm

({T}: Add {B} or {G}.)
Woodland Chasm enters tapped.

Plains

Cleaving Sliver

Winged Sliver

Arctic Treeline

({T}: Add {G} or {W}.)
Arctic Treeline enters tapped.

Alpine Meadow

({T}: Add {R} or {W}.)
Alpine Meadow enters tapped.