Flying

Whenever Nightveil Sprite attacks, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

Nimble Brigand can't be blocked if you've committed a crime this turn. (Targeting opponents, anything they control, and/or cards in their graveyards is a crime.)

Whenever Nimble Brigand deals combat damage to a player, draw a card.

Flying

When Nimble Larcenist enters the battlefield, target opponent reveals their hand. You choose an artifact, instant, or sorcery card from it and exile that card.

Nimble Trapfinder can't be blocked if you had another Cleric, Rogue, Warrior, or Wizard enter the battlefield under your control this turn.

At the beginning of combat on your turn, if you have a full party, creatures you control gain "Whenever this creature deals combat damage to a player, draw a card" until end of turn.

Flying

Whenever Nimbus Champion attacks, you may return target creature to its owner's hand if that creature's power is less than or equal to the number of Warriors your team controls.

Flying (This creature can't be blocked except by creatures with flying or reach.)

Whenever you scry, Nimrodel Watcher gets +1/+0 until end of turn and can't be blocked this turn. This ability triggers only once each turn.

Menace

Ward—Pay 9 life.

Whenever Nine-Fingers Keene deals combat damage to a player, look at the top nine cards of your library. You may put a Gate card from among them onto the battlefield. Then if you control nine or more Gates, put the rest into your hand. Otherwise, put the rest on the bottom of your library in a random order.

Ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

Whenever Ninja of the Deep Hours deals combat damage to a player, you may draw a card.

Defender

Whenever you cast an instant or sorcery spell, Nivix Cyclops gets +3/+0 until end of turn and can attack this turn as though it didn't have defender.

Exile an instant or sorcery spell you control: Put two +1/+1 counters on Nivmagus Elemental. (That spell won't resolve.)

Flying

Whenever Niv-Mizzet, Dracogenius deals damage to a player, you may draw a card.

: Niv-Mizzet, Dracogenius deals 1 damage to any target.

This spell can't be countered.

Flying

Whenever you draw a card, Niv-Mizzet, Parun deals 1 damage to any target.

Whenever a player casts an instant or sorcery spell, you draw a card.

Flying

Whenever you draw a card, Niv-Mizzet, the Firemind deals 1 damage to any target.

: Draw a card.

Noggle Bandit can't be blocked except by creatures with defender.

When Noggle Hedge-Mage enters the battlefield, if you control two or more Islands, you may tap two target permanents.

When Noggle Hedge-Mage enters the battlefield, if you control two or more Mountains, you may have Noggle Hedge-Mage deal 2 damage to target player or planeswalker.

Flash

If an opponent would draw a card except the first one they draw in each of their draw steps, instead that player skips that draw and you draw a card.

Graft 4 (This creature enters the battlefield with four +1/+1 counters on it. Whenever another creature enters the battlefield, you may move a +1/+1 counter from this creature onto it.)

, Remove two +1/+1 counters from among creatures you control: Draw a card.

When Nucklavee enters the battlefield, you may return target red sorcery card from your graveyard to your hand.

When Nucklavee enters the battlefield, you may return target blue instant card from your graveyard to your hand.

When this creature enters the battlefield, roll a six-sided die. Target player mills X cards, where X is the result.

Flash

Flying

Whenever you cast your first spell during each opponent's turn, look at the top two cards of your library. Put one of those cards into your hand and the other into your graveyard.

Flying, vigilance

: Add . Spend this mana only to cast an artifact spell or activate an ability of an artifact source.

Menace

Whenever Obeka, Splitter of Seconds deals combat damage to a player, you get that many additional upkeep steps after this phase.

Flying

, Return a land you control to its owner's hand: Target creature gets -X/-0 until end of turn, where X is the number of cards in your hand.

Flash

Lifelink

When Obscura Interceptor enters the battlefield, it connives. When it connives this way, return up to one target spell to its owner's hand. (To have a creature connive, draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on that creature.)

Flying, ward

Whenever Obsessive Collector deals combat damage to a player, seek a card with mana value equal to the number of cards in your hand.

Flash

Flying

Whenever another Faerie enters the battlefield under your control, each opponent loses 1 life.

Flying

When Oceanus Dragon enters the battlefield, tap target creature an opponent controls. Goad it. (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.)

When Octoprophet enters the battlefield, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Flying

As long as you control a transformed permanent, Oculus Whelp has "When Oculus Whelp dies, draw a card."

At the beginning of your upkeep, look at the top two cards of your library, then put one of them into your graveyard.

Whenever a creature card is put into your graveyard from your library or hand, it perpetually gains "When this card leaves your graveyard, create a tapped 2/2 black Zombie creature token."

When Oji, the Exquisite Blade enters the battlefield, you gain 2 life and scry 2.

Whenever you cast your second spell each turn, exile up to one target creature you control, then return it to the battlefield under its owner's control.

Flying, vigilance

Whenever a Dragon you control attacks, tap target nonland permanent an opponent controls. That permanent doesn't untap during its controller's next untap step.

Flying

You may choose not to untap Old Man of the Sea during your untap step.

: Gain control of target creature with power less than or equal to Old Man of the Sea's power for as long as Old Man of the Sea remains tapped and that creature's power remains less than or equal to Old Man of the Sea's power.

: Add . Spend this mana only to activate abilities.

Flying

Whenever you cycle or discard a card, target creature an opponent controls gets -2/-0 until end of turn.

When Omnath, Locus of Creation enters the battlefield, draw a card.

Landfall — Whenever a land enters the battlefield under your control, you gain 4 life if this is the first time this ability has resolved this turn. If it's the second time, add . If it's the third time, Omnath deals 4 damage to each opponent and each planeswalker you don't control.

: Target creature becomes a Frog with base power and toughness 3/3 until end of turn.

Flying

Whenever you draw a card, put a +1/+1 counter on Oneirophage.

Defender, flying

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

All Slivers have "Whenever this permanent becomes the target of a spell an opponent controls, you may draw a card."

More Than Meets the Eye (You may cast this card converted for .)

At the beginning of each end step, bolster 1. (Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.)

When Optimus Prime dies, return it to the battlefield converted under its owner's control.

When Oracle of Tragedy enters the battlefield or dies, choose one —

• Draw a card, then discard a card.

• Shuffle up to four target cards with mana value 3 or greater from your graveyard into your library.

Whenever Order of the Alabaster Host becomes blocked by a creature, that creature gets -1/-1 until end of turn.

When Organ Hoarder enters the battlefield, look at the top three cards of your library, then put one of them into your hand and the rest into your graveyard.

Changeling

Whenever you cast an instant or sorcery spell, if it targets one or more other permanents you control, create a token that's a copy of one of those permanents.

When a spell or ability an opponent controls causes you to discard this card, create a token that's a copy of target permanent.

This spell costs less to cast for each different mana value among cards in your graveyard.

Whenever you discard a nonland card, you may cast it from your graveyard.

When Outlaw Stitcher enters the battlefield, create a 2/2 blue and black Zombie Rogue creature token, then put two +1/+1 counters on that token for each spell you've cast this turn other than the first.

Plot (You may pay and exile this card from your hand. Cast it as a sorcery on a later turn without paying its mana cost. Plot only as a sorcery.)