Swamp

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.

Abyssal Specter

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

Elixir of Immortality

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

Go for the Throat

Tormod's Crypt

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

Ostracize

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

Insidious Bookworms

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

Marsh Crocodile

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

Lingering Death

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

Temple of Deceit

This land enters tapped.
When this land enters, scry 1. (Look at the top card of your library. You may put that card on the bottom.)
{T}: Add {U} or {B}.

Elderfang Disciple

When Elderfang Disciple enters, each opponent discards a card.

Dismal Backwater

This land enters tapped.
When this land enters, you gain 1 life.
{T}: Add {U} or {B}.

Recoil

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

Stupor

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

Island

Ravenous Rats

When Ravenous Rats enters, target opponent discards a card.

Slither Blade

Avatar of Will

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