Mana Leak

Counter target spell unless its controller pays {3}.

Bad River

Bad River enters tapped.
{T}, Sacrifice Bad River: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.

Heart Sliver

Bamboozle

Target player reveals the top four cards of their library. You choose two of those cards and put them into that player's graveyard. Put the rest on top of their library in any order.

Rocky Tar Pit

Rocky Tar Pit enters tapped.
{T}, Sacrifice Rocky Tar Pit: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle.

Clot Sliver

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

Mindwhip Sliver

All Slivers have "{2}, Sacrifice this permanent: Target player discards a card at random. Activate only as a sorcery."

Boomerang

Return target permanent to its owner's hand.

Metallic Sliver

Swamp

Unsummon

Return target creature to its owner's hand.

Winged Sliver

Mnemonic Sliver

All Slivers have "{2}, Sacrifice this permanent: Draw a card."

Island

Inspiration

Mountain

Force Spike

Counter target spell unless its controller pays {1}.