Midnight Banshee

Wither (This deals damage to creatures in the form of -1/-1 counters.)
At the beginning of your upkeep, put a -1/-1 counter on each nonblack creature.

Plague of Vermin

Starting with you, each player may pay any amount of life. Repeat this process until no one pays life. Each player creates a 1/1 black Rat creature token for each 1 life they paid this way.

Polluted Bonds

Whenever a land an opponent controls enters, that player loses 2 life and you gain 2 life.

Puppeteer Clique

Flying
When this creature enters, put target creature card from an opponent's graveyard onto the battlefield under your control. It gains haste. At the beginning of your next end step, exile it.
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Rite of Consumption

As an additional cost to cast this spell, sacrifice a creature.
Rite of Consumption deals damage equal to the sacrificed creature's power to target player or planeswalker. You gain life equal to the damage dealt this way.

Sickle Ripper

Wither (This deals damage to creatures in the form of -1/-1 counters.)

Smolder Initiate

Whenever a player casts a black spell, you may pay {1}. If you do, target player loses 1 life.

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.

Inquisitor's Snare

Prevent all damage target attacking or blocking creature would deal this turn. If that creature is black or red, destroy it.

Torture

Enchant creature
{1}{B}: Put a -1/-1 counter on enchanted creature.

Wound Reflection

At the beginning of each end step, each opponent loses life equal to the life they lost this turn. (Damage causes loss of life.)

Blistering Dieflyn

Flying
{B/R}: This creature gets +1/+0 until end of turn.

Bloodmark Mentor

Red creatures you control have first strike.

Bloodshed Fever

Enchant creature
Enchanted creature attacks each combat if able.

Boggart Arsonists

Plainswalk (This creature can't be blocked as long as defending player controls a Plains.)
{2}{R}, Sacrifice this creature: Destroy target Scarecrow or Plains.

Burn Trail

Burn Trail deals 3 damage to any target.
Conspire (As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy.)

Shadowmoor