Inspiration

Mana Leak

Counter target spell unless its controller pays {3}.

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.

Metallic Sliver

Heart Sliver

Mindwhip Sliver

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

Force Spike

Counter target spell unless its controller pays {1}.

Clot Sliver

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

Winged Sliver

Swamp

Boomerang

Return target permanent to its owner's hand.

Rocky Tar Pit

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

Mountain

Unsummon

Return target creature to its owner's hand.

Mind Rot

Bad River

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