Elderfang Disciple

When Elderfang Disciple enters the battlefield, each opponent discards a card.

Yarok's Fenlurker

When Yarok's Fenlurker enters the battlefield, each opponent exiles a card from their hand.
{2}{B}: Yarok's Fenlurker gets +1/+1 until end of turn.

Black Cat

When Black Cat dies, target opponent discards a card at random.

Acquisitions Expert

When Acquisitions Expert enters the battlefield, target opponent reveals a number of cards from their hand equal to the number of creatures in your party. You choose one of those cards. That player discards that card. (Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.)

Ashen-Skin Zubera

When Ashen-Skin Zubera dies, target opponent discards a card for each Zubera that died this turn.

Elvish Doomsayer

When Elvish Doomsayer dies, each opponent discards a card.

Ravenous Rats

When Ravenous Rats enters the battlefield, target opponent discards a card.

Clattering Augur

Clattering Augur can't block.
When Clattering Augur enters the battlefield, you draw a card and you lose 1 life.
{2}{B}{B}: Return Clattering Augur from your graveyard to your hand.

Disciple of Phenax

When Disciple of Phenax enters the battlefield, target player reveals a number of cards from their hand equal to your devotion to black. You choose one of them. That player discards that card. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)

Abyssal Gatekeeper

When Abyssal Gatekeeper dies, each player sacrifices a creature.

Burglar Rat

When Burglar Rat enters the battlefield, each opponent discards a card.

Virus Beetle

When Virus Beetle enters the battlefield, each opponent discards a card.

Unscrupulous Agent

When Unscrupulous Agent enters the battlefield, target opponent exiles a card from their hand.

Attrition

{B}, Sacrifice a creature: Destroy target nonblack creature.

Big Game Hunter

When Big Game Hunter enters the battlefield, destroy target creature with power 4 or greater. It can't be regenerated.
Madness {B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Nezumi Informant

When Nezumi Informant enters the battlefield, each opponent discards a card.

Shirei, Shizo's Caretaker

Whenever a creature with power 1 or less is put into your graveyard from the battlefield, you may return that card to the battlefield at the beginning of the next end step if Shirei, Shizo's Caretaker is still on the battlefield.

Corrupt Court Official

When Corrupt Court Official enters the battlefield, target opponent discards a card.