Force Spike

Counter target spell unless its controller pays {1}.

Unsummon

Return target creature to its owner's hand.

Swamp

Metallic Sliver

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.

Island

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.

Mountain

Clot Sliver

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

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.

Inspiration

Mind Rot

Mana Leak

Counter target spell unless its controller pays {3}.

Boomerang

Return target permanent to its owner's hand.

Mnemonic Sliver

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

Mindwhip Sliver

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