Murderous Betrayal

Enchantment

, Pay half your life, rounded up: Destroy target nonblack creature. It can't be regenerated.

Necromancer's Magemark

Enchantment — Aura

Enchant creature
Creatures you control that are enchanted get +1/+1.
If a creature you control that's enchanted would die, return it to its owner's hand instead.

Necromancer's Stockpile

Enchantment

, Discard a creature card: Draw a card. If the discarded card was a Zombie card, create a tapped 2/2 black Zombie creature token.

Nefarious Lich

Enchantment

If damage would be dealt to you, exile that many cards from your graveyard instead. If you can't, you lose the game.
If you would gain life, draw that many cards instead.
When Nefarious Lich leaves the battlefield, you lose the game.

Nest of Scarabs

Enchantment

Whenever you put one or more -1/-1 counters on a creature, create that many 1/1 black Insect creature tokens.

Nettling Curse

Enchantment — Aura

Enchant creature
Whenever enchanted creature attacks or blocks, its controller loses 3 life.
: Enchanted creature attacks this turn if able.

Night of Souls' Betrayal

Legendary Enchantment

All creatures get -1/-1.

Nightmare Shepherd

Enchantment Creature — Demon (4/4)

Flying
Whenever another nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of that creature, except it's 1/1 and it's a Nightmare in addition to its other types.

Nihilistic Glee

Enchantment

, Discard a card: Target opponent loses 1 life and you gain 1 life.
Hellbent — , Pay 2 life: Draw a card. Activate only if you have no cards in hand.

No Mercy

Enchantment

Whenever a creature deals damage to you, destroy it.

No Rest for the Wicked

Enchantment

Sacrifice No Rest for the Wicked: Return to your hand all creature cards in your graveyard that were put there from the battlefield this turn.

Nyx Infusion

Enchantment — Aura

Enchant creature
Enchanted creature gets +2/+2 as long as it's an enchantment. Otherwise, it gets -2/-2.

Nyxborn Eidolon

Enchantment Creature — Spirit (2/1)

Bestow (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)
Enchanted creature gets +2/+1.

Nyxborn Marauder

Enchantment Creature — Minotaur (4/3)

Oblivion Crown

Enchantment — Aura

Flash (You may cast this spell any time you could cast an instant.)
Enchant creature
Enchanted creature has "Discard a card: This creature gets +1/+1 until end of turn."

Oubliette

Enchantment

When Oubliette enters the battlefield, target creature phases out until Oubliette leaves the battlefield. Tap that creature as it phases in this way. (Auras and Equipment phase out with it. While permanents are phased out, they're treated as though they don't exist.)

Patriarch's Desire

Enchantment — Aura

Enchant creature
Enchanted creature gets +2/-2.
Threshold — Enchanted creature gets an additional +2/-2 as long as seven or more cards are in your graveyard.

Phyrexian Boon

Enchantment — Aura

Enchant creature
Enchanted creature gets +2/+1 as long as it's black. Otherwise, it gets -1/-2.

Phyrexian Scriptures

Enchantment — Saga

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Put a +1/+1 counter on up to one target creature. That creature becomes an artifact in addition to its other types.
II — Destroy all nonartifact creatures.
III — Exile all opponents' graveyards.

Pillory of the Sleepless

Enchantment — Aura

Enchant creature
Enchanted creature can't attack or block.
Enchanted creature has "At the beginning of your upkeep, you lose 1 life."