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When Necromancer's Covenant enters the battlefield, exile all creature cards from target player's graveyard, then create a 2/2 black Zombie creature token for each card exiled this way.
Zombies you control have lifelink.

You may cast Necromancy as though it had flash. If you cast it any time a sorcery couldn't have been cast, the controller of the permanent it becomes sacrifices it at the beginning of the next cleanup step.
When Necromancy enters the battlefield, if it's on the battlefield, it becomes an Aura with "enchant creature put onto the battlefield with Necromancy." Put target creature card from a graveyard onto the battlefield under your control and attach Necromancy to it. When Necromancy leaves the battlefield, that creature's controller sacrifices it.

Flash
Synaptic Disintegrator — When Necron Deathmark enters the battlefield, destroy up to one target creature and target player mills three cards.

First strike
When Nekrataal enters the battlefield, destroy target nonartifact, nonblack creature. That creature can't be regenerated.

Flying
When Nephalia Moondrakes enters the battlefield, target creature gains flying until end of turn.
{4}{U}{U}, Exile Nephalia Moondrakes from your graveyard: Creatures you control gain flying until end of turn.

Enchant creature
When Nerd Rage enters the battlefield, draw two cards.
Enchanted creature has "You have no maximum hand size" and "Whenever this creature attacks, if you have ten or more cards in hand, it gets +10/+10 until end of turn."

Tribute 3
When Nessian Demolok enters the battlefield, if tribute wasn't paid, destroy target noncreature permanent.

When Nessian Game Warden enters the battlefield, look at the top X cards of your library, where X is the number of Forests you control. You may reveal a creature card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

Tribute 6
When Nessian Wilds Ravager enters the battlefield, if tribute wasn't paid, you may have Nessian Wilds Ravager fight another target creature.

When Nest Invader enters the battlefield, create a 0/1 colorless Eldrazi Spawn creature token. It has "Sacrifice this creature: Add {C}."

Trample
When Nesting Wurm enters the battlefield, you may search your library for up to three cards named Nesting Wurm, reveal them, put them into your hand, then shuffle.

When Netherborn Phalanx enters the battlefield, each opponent loses 1 life for each creature they control.
Transmute {1}{B}{B}

Flying
When Network Disruptor enters the battlefield, tap target permanent.

Flying
When Neurok Familiar enters the battlefield, reveal the top card of your library. If it's an artifact card, put it into your hand. Otherwise, put it into your graveyard.

Neurok Invisimancer can't be blocked.
When Neurok Invisimancer enters the battlefield, target creature can't be blocked this turn.

Menace
When Neva, Stalked by Nightmares enters the battlefield, return target creature or enchantment card from your graveyard to your hand.
Whenever an enchantment you control is put into a graveyard from the battlefield, put a +1/+1 counter on Neva, then scry 1.

Hexproof from artifacts, creatures, and enchantments
When Nevinyrral, Urborg Tyrant enters the battlefield, create a tapped 2/2 black Zombie creature token for each creature that died this turn.
When Nevinyrral dies, you may pay {1}. When you do, destroy all artifacts, creatures, and enchantments.

New Benalia enters the battlefield tapped.
When New Benalia enters the battlefield, scry 1.
{T}: Add {W}.

Enchant land
When New Horizons enters the battlefield, put a +1/+1 counter on target creature you control.
Enchanted land has "{T}: Add two mana of any one color."

When New Perspectives enters the battlefield, draw three cards.
As long as you have seven or more cards in hand, you may pay {0} rather than pay cycling costs.

Menace
When Nezumi Freewheeler enters the battlefield, each player mills three cards.
{5}{W/P}: Transform Nezumi Freewheeler. Activate only as a sorcery.

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

Ninjutsu {1}{B}
When Nezumi Prowler enters the battlefield, target creature you control gains deathtouch and lifelink until end of turn.

Flash
When Niambi, Beloved Protector enters the battlefield, if you cast it, choose target nonlegendary creature card in your graveyard that was put there from the battlefield this turn. Return it to the battlefield. It perpetually gains "Whenever this creature becomes the target of a spell or ability, draw a card. This ability triggers only once each turn."

Flash
When Niambi, Esteemed Speaker enters the battlefield, you may return another target creature you control to its owner's hand. If you do, you gain life equal to that creature's mana value.
{1}{W}{U}, {T}, Discard a legendary card: Draw two cards.