Have

Funeral Charm

Choose one —
• Target player discards a card.
• Target creature gets +2/-1 until end of turn.
• Target creature gains swampwalk until end of turn. (It can't be blocked as long as defending player controls a Swamp.)

Kelinore Bat

Larceny

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

Mind Sludge

Target player discards a card for each Swamp you control.

Oppression

Whenever a player casts a spell, that player discards a card.

Inherited Fiend

Flying
{2}{B}: Exile target creature card from a graveyard. Put a +1/+1 counter on this creature.

Heirloom Mirror

{1}, {T}, Pay 1 life, Discard a card: Draw a card, mill a card, then put a ritual counter on this artifact. Then if it has three or more ritual counters on it, remove them and transform it. Activate only as a sorcery.

Heirloom Mirror // Inherited Fiend

Abyssal Specter

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

Temple of the Dead

(Transforms from Aclazotz, Deepest Betrayal.)
{T}: Add {B}.
{2}{B}, {T}: Transform this land. Activate only if a player has one or fewer cards in hand and only as a sorcery.

Aclazotz, Deepest Betrayal

Flying, lifelink
Whenever Aclazotz attacks, each opponent discards a card. For each opponent who can't, you draw a card.
Whenever an opponent discards a land card, create a 1/1 black Bat creature token with flying.
When Aclazotz dies, return it to the battlefield tapped and transformed under its owner's control.

Aclazotz, Deepest Betrayal // Temple of the Dead

Arterial Flow

Each opponent discards two cards. If you control a Vampire, each opponent loses 2 life and you gain 2 life.

Implement of Malice

{B}, Sacrifice this artifact: Target player discards a card. Activate only as a sorcery.
When this artifact is put into a graveyard from the battlefield, draw a card.

Aid the Fallen

Choose one or both —
• Return target creature card from your graveyard to your hand.
• Return target planeswalker card from your graveyard to your hand.

Geth's Grimoire

Whenever an opponent discards a card, you may draw a card.

Mind Ravel

Target player discards a card.
Draw a card at the beginning of the next turn's upkeep.

Splitting Headache

Choose one —
• Target player discards two cards.
• Target player reveals their hand. You choose a card from it. That player discards that card.

Sengir Bats

Flying
Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature.

Dirge Bat

Mutate {4}{B}{B} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Flash
Flying
Whenever this creature mutates, destroy target creature or planeswalker an opponent controls.

Encroach

Target player reveals their hand. You choose a nonbasic land card from it. That player discards that card.

Duskhunter Bat

Bloodthirst 1 (If an opponent was dealt damage this turn, this creature enters with a +1/+1 counter on it.)
Flying

Eyetwitch

Flying
When this creature dies, learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)

Blight Keeper

Flying
{7}{B}, {T}, Sacrifice this creature: Target opponent loses 4 life and you gain 4 life.

Stirge

Flying
This creature can't block.
Blood Drain — {1}{B}, Pay 1 life, Sacrifice this creature: Draw a card.

Hymn to Tourach

Target player discards two cards at random.

Bartizan Bats

Flying (This creature can't be blocked except by creatures with flying or reach.)

Defile

Target creature gets -1/-1 until end of turn for each Swamp you control.

Blackmail

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

Bone Shards

As an additional cost to cast this spell, sacrifice a creature or discard a card.
Destroy target creature or planeswalker.

Davriel, Rogue Shadowmage

At the beginning of each opponent's upkeep, if that player has one or fewer cards in hand, Davriel deals 2 damage to them.
−1: Target player discards a card.

Stalking Vampire

At the beginning of your upkeep, you may pay {2}{B}{B}. If you do, transform this creature.

Screeching Bat

Flying
At the beginning of your upkeep, you may pay {2}{B}{B}. If you do, transform this creature.

Screeching Bat // Stalking Vampire

Dementia Bat

Flying
{4}{B}, Sacrifice this creature: Target player discards two cards.

Foundry Screecher

Flying
This creature gets +1/+0 as long as you control an artifact.

Basilica Screecher

Flying
Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)

Mental Agony

Target player discards two cards and loses 2 life.

Open the Graves

Whenever a nontoken creature you control dies, create a 2/2 black Zombie creature token.

Blighted Bat

Flying
{1}: This creature gains haste until end of turn.

Gloomhunter

Assassin's Strike

Destroy target creature. Its controller discards a card.

Mind Warp

Look at target player's hand and choose X cards from it. That player discards those cards.

Demonic Vigor

Enchant creature
Enchanted creature gets +1/+1.
When enchanted creature dies, return that card to its owner's hand.

Malakir Familiar

Flying, deathtouch
Whenever you gain life, this creature gets +1/+1 until end of turn.

Marrow Bats

Flying
Pay 4 life: Regenerate this creature.

Mire's Toll

Target player reveals a number of cards from their hand equal to the number of Swamps you control. You choose one of them. That player discards that card.

Grimclaw Bats

Flying
{B}, Pay 1 life: This creature gets +1/+1 until end of turn.

Aspect of Lamprey

Enchant creature you control
When this Aura enters, target opponent discards two cards.
Enchanted creature has lifelink.

Painful Quandary

Whenever an opponent casts a spell, that player loses 5 life unless they discard a card.

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.

Murder

Coercion

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

Syphon Mind

Each other player discards a card. You draw a card for each card discarded this way.

Mirkwood Bats

Flying
Whenever you create or sacrifice a token, each opponent loses 1 life.

No Way Out

Target opponent discards two cards. You create a 2/2 black Zombie creature token with decayed. (It can't block. When it attacks, sacrifice it at end of combat.)

Vampire Bats

Flying (This creature can't be blocked except by creatures with flying or reach.)
{B}: This creature gets +1/+0 until end of turn. Activate no more than twice each turn.

Font of Return

{3}{B}, Sacrifice this enchantment: Return up to three target creature cards from your graveyard to your hand.

Brink of Madness

At the beginning of your upkeep, if you have no cards in hand, sacrifice this enchantment and target opponent discards their hand.

Skull Fracture

Target player discards a card.
Flashback {3}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Scepter of Fugue

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

Swamp

Deep-Cavern Bat

Flying, lifelink
When this creature enters, look at target opponent's hand. You may exile a nonland card from it until this creature leaves the battlefield.

Courier Bat

Flying
When this creature enters, if you gained life this turn, return up to one target creature card from your graveyard to your hand.

Mind Rot

Ghastly Gloomhunter

Kicker {3}{B} (You may pay an additional {3}{B} as you cast this spell.)
Flying, lifelink
If this creature was kicked, it enters with two +1/+1 counters on it.

Stupor

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

Geier Reach Sanitarium

{T}: Add {C}.
{2}, {T}: Each player draws a card, then discards a card.

Cry of Contrition

Target player discards a card.
Haunt (When this spell card is put into a graveyard after resolving, exile it haunting target creature.)
When the creature this card haunts dies, target player discards a card.

Megrim

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

Bloodhunter Bat

Flying
When this creature enters, target player loses 2 life and you gain 2 life.