As an additional cost to cast this spell, discard X cards.
Look at target opponent's hand and choose X cards from it. That player discards those cards.
{4}{B}{B}
Abyssal Horror
Creature - Horror
Flying
When Abyssal Horror enters the battlefield, target player discards two cards.
2 /
2
{1}{B}
Addle
Sorcery
Choose a color. Target player reveals their hand and you choose a card of that color from it. That player discards that card.
{2}
Arcane Signet
Artifact
{T}: Add one mana of any color in your commander's color identity.
{1}{B}{B}
Bottomless Pit
Enchantment
At the beginning of each player's upkeep, that player discards a card at random.
{1}{B}
Burglar Rat
Creature - Rat
When Burglar Rat enters the battlefield, each opponent discards a card.
1 /
1
--
Cabal Coffers
Land
{2}, {T}: Add {B} for each Swamp you control.
{2}
Charcoal Diamond
Artifact
Charcoal Diamond enters the battlefield tapped.
{T}: Add {B}.
{2}{B}
Dark Deal
Sorcery
Each player discards all the cards in their hand, then draws that many cards minus one.
{B}
Dark Ritual
Instant
Add {B}{B}{B}.
{2}{B}
Demon's Disciple
Creature - Human Cleric
When Demon's Disciple enters the battlefield, each player sacrifices a creature or planeswalker.
3 /
1
{1}{B}
Elderfang Disciple
Creature - Elf Cleric
When Elderfang Disciple enters the battlefield, each opponent discards a card.
1 /
1
{2}{B}
Fleshbag Marauder
Creature - Zombie Warrior
When Fleshbag Marauder enters the battlefield, each player sacrifices a creature.
3 /
1
--
Geier Reach Sanitarium
Legendary Land
{T}: Add {C}.
{2}, {T}: Each player draws a card, then discards a card.
{4}
Geth's Grimoire
Artifact
Whenever an opponent discards a card, you may draw a card.
{B}
Innocent Blood
Sorcery
Each player sacrifices a creature.
{3}{B}{B}
Liliana Vess
Legendary Planeswalker - Liliana
+1: Target player discards a card.
-2: Search your library for a card, then shuffle and put that card on top.
-8: Put all creature cards from all graveyards onto the battlefield under your control.
L:
5
{1}{B}{B}
Liliana of the Veil
Legendary Planeswalker - Liliana
+1: Each player discards a card.
-2: Target player sacrifices a creature.
-6: Separate all permanents target player controls into two piles. That player sacrifices all permanents in the pile of their choice.
L:
3
{1}{B}
Liliana's Caress
Enchantment
Whenever an opponent discards a card, that player loses 2 life.
{1}{B}
Liliana's Triumph
Instant
Each opponent sacrifices a creature. If you control a Liliana planeswalker, each opponent also discards a card.
{4}{B}{B}
Liliana, Dreadhorde General
Legendary Planeswalker - Liliana
Whenever a creature you control dies, draw a card.
+1: Create a 2/2 black Zombie creature token.
-4: Each player sacrifices two creatures.
-9: Each opponent chooses a permanent they control of each permanent type and sacrifices the rest.
L:
6
{2}{B}{B}
Liliana, Waker of the Dead
Legendary Planeswalker - Liliana
+1: Each player discards a card. Each opponent who can't loses 3 life.
-3: Target creature gets -X/-X until end of turn, where X is the number of cards in your graveyard.
-7: You get an emblem with "At the beginning of combat on your turn, put target creature card from a graveyard onto the battlefield under your control. It gains haste."
L:
4
{3}{B}
Make an Example
Sorcery
Each opponent separates the creatures they control into two piles. For each opponent, you choose one of their piles. Each opponent sacrifices the creatures in their chosen pile. (Piles can be empty.)
{1}{B}
Mire in Misery
Sorcery
Each opponent sacrifices a creature or enchantment.
{2}{B}
Plaguecrafter
Creature - Human Shaman
When Plaguecrafter enters the battlefield, each player sacrifices a creature or planeswalker. Each player who can't discards a card.
3 /
2
{2}{B}{B}
Rankle, Master of Pranks
Legendary Creature - Faerie Rogue
Flying, haste
Whenever Rankle, Master of Pranks deals combat damage to a player, choose any number --
• Each player discards a card.
• Each player loses 1 life and draws a card.
• Each player sacrifices a creature.
3 /
3
{B}{B}
Smallpox
Sorcery
Each player loses 1 life, discards a card, sacrifices a creature, then sacrifices a land.
{1}
Sol Ring
Artifact
{T}: Add {C}{C}.
{2}{B}
Soul Shatter
Instant
Each opponent sacrifices a creature or planeswalker with the highest mana value among creatures and planeswalkers they control.
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
{3}{B}
Syphon Mind
Sorcery
Each other player discards a card. You draw a card for each card discarded this way.
{3}{B}{B}
Tergrid, God of Fright
Legendary Creature - God
Menace
Whenever an opponent sacrifices a nontoken permanent or discards a permanent card, you may put that card from a graveyard onto the battlefield under your control.
4 /
5
--
Tergrid's Lantern
Legendary Artifact
{T}: Target player loses 3 life unless they sacrifice a nonland permanent or discard a card.
{3}{B}: Untap Tergrid's Lantern.
4 /
5
{1}{B}
Virus Beetle
Artifact Creature - Insect
When Virus Beetle enters the battlefield, each opponent discards a card.
1 /
1
{2}{B}
Vona's Hunger
Instant
Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)
Each opponent sacrifices a creature. If you have the city's blessing, instead each opponent sacrifices half the creatures they control, rounded up.
{1}{B}
Waste Not
Enchantment
Whenever an opponent discards a creature card, create a 2/2 black Zombie creature token.
Whenever an opponent discards a land card, add {B}{B}.
Whenever an opponent discards a noncreature, nonland card, draw a card.