Insidious Bookworms

When Insidious Bookworms dies, you may pay {1}{B}. If you do, target player discards a card at random.

Ostracize

Target opponent reveals their hand. You choose a creature card from it. That player discards that card.

Elixir of Immortality

{2}, {T}: You gain 5 life. Shuffle Elixir of Immortality and your graveyard into their owner's library.

Elderfang Disciple

When Elderfang Disciple enters the battlefield, each opponent discards a card.

Abyssal Specter

Flying
Whenever Abyssal Specter deals damage to a player, that player discards a card.

Megrim

Whenever an opponent discards a card, Megrim deals 2 damage to that player.

Duress

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

Swamp

Temple of Deceit

Temple of Deceit enters the battlefield tapped.
When Temple of Deceit enters the battlefield, scry 1.
{T}: Add {U} or {B}.

Avatar of Will

If an opponent has no cards in hand, this spell costs {6} less to cast.
Flying

Marsh Crocodile

When Marsh Crocodile enters the battlefield, return a blue or black creature you control to its owner's hand.
When Marsh Crocodile enters the battlefield, each player discards a card.

Recoil

Return target permanent to its owner's hand. Then that player discards a card.

Island

Slither Blade

Lingering Death

Enchant creature
At the beginning of the end step of enchanted creature's controller, that player sacrifices that creature.

Go for the Throat

Counterspell

Ravenous Rats

When Ravenous Rats enters the battlefield, target opponent discards a card.

Stupor

Target opponent discards a card at random, then discards a card.

Tormod's Crypt

{T}, Sacrifice Tormod's Crypt: Exile target player's graveyard.

Dismal Backwater

Dismal Backwater enters the battlefield tapped.
When Dismal Backwater enters the battlefield, you gain 1 life.
{T}: Add {U} or {B}.