Mind Funeral

Target opponent reveals cards from the top of their library until four land cards are revealed. That player puts all cards revealed this way into their graveyard.

Hopeless Nightmare

When this enchantment enters, each opponent discards a card and loses 2 life.
When this enchantment is put into a graveyard from the battlefield, scry 2.
{2}{B}: Sacrifice this enchantment.

Glimpse the Unthinkable

Thought Vessel

You have no maximum hand size.
{T}: Add {C}.

Abyssal Specter

Flying
Whenever this creature deals damage to a player, that player discards a card.

Psychic Symbiont

Flying
When this creature enters, target opponent discards a card and you draw a card.

Island

Hypnotic Specter

Flying
Whenever this creature deals damage to an opponent, that player discards a card at random.

Dismal Backwater

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

Vertigo Spawn

Defender
Whenever this creature blocks a creature, tap that creature. That creature doesn't untap during its controller's next untap step.

Waking Nightmare

Nightmarish End

Target creature gets -X/-X until end of turn, where X is the number of cards in your hand.

Sleep

Tap all creatures target player controls. Those creatures don't untap during that player's next untap step.

Wall of Lost Thoughts

Defender (This creature can't attack.)
When this creature enters, target player mills four cards. (They put the top four cards of their library into their graveyard.)

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.

Swamp

Millstone

Duskmantle, House of Shadow

{T}: Add {C}.
{U}{B}, {T}: Target player mills a card.

Mesmeric Fiend

When this creature enters, target opponent reveals their hand and you choose a nonland card from it. Exile that card.
When this creature leaves the battlefield, return the exiled card to its owner's hand.

Murmuring Phantasm

Dream Twist

Target player mills three cards.
Flashback {1}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Curse of the Bloody Tome

Enchant player
At the beginning of enchanted player's upkeep, that player mills two cards.

Gibbering Barricade

Defender
{2}{B}, Sacrifice a creature: You gain 1 life and draw a card.

Narcolepsy

Enchant creature
At the beginning of each upkeep, if enchanted creature is untapped, tap it.

Taken by Nightmares

Exile target creature. If you control an enchantment, scry 2.

Traumatize

Target player mills half their library, rounded down.

Ashiok, Dream Render

Spells and abilities your opponents control can't cause their controller to search their library.
−1: Target player mills four cards. Then exile each opponent's graveyard.

Induce Paranoia

Counter target spell. If {B} was spent to cast this spell, that spell's controller mills X cards, where X is the spell's mana value.

Night Terrors

Target player reveals their hand. You choose a nonland card from it. Exile that card.

Faceless Butcher

When this creature enters, exile another target creature.
When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control.