Insatiable Avarice

Spree (Choose one or more additional costs.)
+ {2} — Search your library for a card, then shuffle and put that card on top.
+ {B}{B} — Target player draws three cards and loses 3 life.

Prowling Nightstalker

This creature can't be blocked except by black creatures.

Staff of the Death Magus

Whenever you cast a black spell or a Swamp you control enters, you gain 1 life.

Predatory Nightstalker

When this creature enters, you may have target opponent sacrifice a creature of their choice.

Taken by Nightmares

Exile target creature. If you control an enchantment, scry 2.

Abyssal Nightstalker

Whenever this creature attacks and isn't blocked, defending player discards a card.

Nightmare Unmaking

Choose one —
• Exile each creature with power greater than the number of cards in your hand.
• Exile each creature with power less than the number of cards in your hand.

Bontu's Monument

Black creature spells you cast cost {1} less to cast.
Whenever you cast a creature spell, each opponent loses 1 life and you gain 1 life.

Bad Moon

Shard of the Nightbringer

Flying
Drain Life — When this creature enters, if you cast it, target opponent loses half their life, rounded up. You gain life equal to the life lost this way.

Breathstealer

{B}: This creature gets +1/-1 until end of turn.

Nightstalker Engine

Nightstalker Engine's power is equal to the number of creature cards in your graveyard.

Withering Torment

Destroy target creature or enchantment. You lose 2 life.

Fen Stalker

This creature has fear as long as you control no untapped lands. (It can't be blocked except by artifact creatures and/or black creatures.)

Feral Shadow

Return of the Nightstalkers

Return all Nightstalker permanent cards from your graveyard to the battlefield. Then destroy all Swamps you control.

Scent of Nightshade

Reveal any number of black cards in your hand. Target creature gets -X/-X until end of turn, where X is the number of cards revealed this way.

Cover of Darkness

As this enchantment enters, choose a creature type.
Creatures of the chosen type have fear. (They can't be blocked except by artifact creatures and/or black creatures.)

Urborg Panther

{B}, Sacrifice this creature: Destroy target creature blocking it.
Sacrifice a creature named Feral Shadow, a creature named Breathstealer, and this creature: Search your library for a card named Spirit of the Night, put that card onto the battlefield, then shuffle.

Swamp

Brutal Nightstalker

When this creature enters, you may have target opponent discard a card.

Night's Whisper

Shimian Night Stalker

{B}, {T}: All damage that would be dealt to you this turn by target attacking creature is dealt to this creature instead.

Lurking Nightstalker

Whenever this creature attacks, it gets +2/+0 until end of turn.

Grave Pact

Whenever a creature you control dies, each other player sacrifices a creature of their choice.

Nightmarish End

Target creature gets -X/-X until end of turn, where X is the number of cards in your hand.

Behold the Beyond

Discard your hand. Search your library for three cards, put them into your hand, then shuffle.

Recurring Nightmare

Sacrifice a creature, Return this enchantment to its owner's hand: Return target creature card from your graveyard to the battlefield. Activate only as a sorcery.

Victim of Night

Destroy target non-Vampire, non-Werewolf, non-Zombie creature.

Attrition

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

Nightmare Incursion

Search target player's library for up to X cards, where X is the number of Swamps you control, and exile them. Then that player shuffles.

Raiding Nightstalker

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

No Rest for the Wicked

Sacrifice this enchantment: Return to your hand all creature cards in your graveyard that were put there from the battlefield this turn.

Spirit of the Night

Flying, trample, haste, protection from black
Spirit of the Night has first strike as long as it's attacking.