Jester's Cap

{2}, {T}, Sacrifice this artifact: Search target player's library for three cards and exile them. Then that player shuffles.

Telepathy

Your opponents play with their hands revealed.

Swamp

Diabolic Tutor

Search your library for a card, put that card into your hand, then shuffle.

Tolarian Winds

Discard all the cards in your hand, then draw that many cards.

Ostracize

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

Rag Man

{B}{B}{B}, {T}: Target opponent reveals their hand and discards a creature card at random. Activate only during your turn.

Nebuchadnezzar

{X}, {T}: Choose a card name. Target opponent reveals X cards at random from their hand. Then that player discards all cards with that name revealed this way. Activate only during your turn.

City of Brass

Whenever this land becomes tapped, it deals 1 damage to you.
{T}: Add one mana of any color.

Underground River

{T}: Add {C}.
{T}: Add {U} or {B}. This land deals 1 damage to you.

Plague Wind

Destroy all creatures you don't control. They can't be regenerated.

Mortivore

Mortivore's power and toughness are each equal to the number of creature cards in all graveyards.
{B}: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Mind Sludge

Target player discards a card for each Swamp you control.

Deflection

Change the target of target spell with a single target.

Abyssal Horror

Flying
When this creature enters, target player discards two cards.

Nevinyrral's Disk

This artifact enters tapped.
{1}, {T}: Destroy all artifacts, creatures, and enchantments.

Mindslicer

When this creature dies, each player discards their hand.

Abyssal Specter

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

Icy Manipulator

{1}, {T}: Tap target artifact, creature, or land.

Teferi's Puzzle Box

At the beginning of each player's draw step, that player puts the cards in their hand on the bottom of their library in any order, then draws that many cards.

Merfolk Looter

Basalt Monolith

This artifact doesn't untap during your untap step.
{T}: Add {C}{C}{C}.
{3}: Untap this artifact.

Archivist

Disrupting Scepter

{3}, {T}: Target player discards a card. Activate only during your turn.

Blue Elemental Blast

Choose one —
• Counter target red spell.
• Destroy target red permanent.

Blackmail

Target player reveals three cards from their hand and you choose one of them. That player discards that card.

Vampiric Tutor

Search your library for a card, then shuffle and put that card on top. You lose 2 life.

Temporal Adept

{U}{U}{U}, {T}: Return target permanent to its owner's hand.

Island

Will-o'-the-Wisp

Flying (This creature can't be blocked except by creatures with flying or reach.)
{B}: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Hypnotic Specter

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

Diabolic Vision

Look at the top five cards of your library. Put one of them into your hand and the rest on top of your library in any order.

Remove Soul

Dark Banishing

Destroy target nonblack creature. It can't be regenerated.

Sleight of Hand

Look at the top two cards of your library. Put one of them into your hand and the other on the bottom of your library.

Cackling Fiend

When this creature enters, each opponent discards a card.

Mana Leak

Counter target spell unless its controller pays {3}.

Spell Blast

Counter target spell with mana value X. (For example, if that spell's mana cost is {3}{U}{U}, X is 5.)

Terror

Destroy target nonartifact, nonblack creature. It can't be regenerated.

Mind Twist

Target player discards X cards at random.

Arcane Laboratory

Each player can't cast more than one spell each turn.

Brainstorm

Draw three cards, then put two cards from your hand on top of your library in any order.

Counterspell

Dark Ritual

Hymn to Tourach

Target player discards two cards at random.

Flash Counter

Sol Ring

Merchant Scroll

Search your library for a blue instant card, reveal that card, put it into your hand, then shuffle.

Nekrataal

First strike
When this creature enters, destroy target nonartifact, nonblack creature. That creature can't be regenerated.

Megrim

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

Salt Marsh

This land enters tapped.
{T}: Add {U} or {B}.

Time Warp

Target player takes an extra turn after this one.

Mana Vault

This artifact doesn't untap during your untap step.
At the beginning of your upkeep, you may pay {4}. If you do, untap this artifact.
At the beginning of your draw step, if this artifact is tapped, it deals 1 damage to you.
{T}: Add {C}{C}{C}.

Evacuation

Return all creatures to their owners' hands.

Concentrate

Mind Rot

Demonic Tutor

Library of Leng

You have no maximum hand size.
If an effect causes you to discard a card, discard it, but you may put it on top of your library instead of into your graveyard.

Larceny

Whenever a creature you control deals combat damage to a player, that player discards a card.