Creatures you control with counters on them have all activated abilities of other creatures you control with counters on them.
{1}, {T}: Teach target creature vigilance.

New Recruit has first strike as long as it is attacking.
When New Recruit dies, create a 2/2 black Zombie creature token.

When Night Squad enters, teach target creature menace. If you put a +1/+1 counter on it this way, it can't be blocked this turn.

Whenever another creature you control enters, you gain 2 life.

Enchant creature you control
All damage that would be dealt to you is dealt to enchanted creature instead.
If a source would deal damage to enchanted creature, if you control three or more enchantments, prevent 1 of that damage.

Flash
Lifelink
When Nikon, Skophos Protector enters, the next time a source of your choice would deal damage to you or a permanent you control this turn, prevent that damage. If damage is prevented this way, Nikon deals that much damage to that source's controller.

Nimbus of Thought enters tapped.
{T}: Add {U} or {R}.
{4}{U/R}: Until end of turn, Nimbus of Thought becomes a 3/3 blue and red Elemental creature with “Whenever this creature becomes tapped, you may discard a card. If you do, draw a card.” It's still a land. This ability costs {X} less to activate, where X is your devotion to blue and red. Activate only once each turn.

Flying, first strike
While you're looking at one or more cards on top of your library except while searching, you may reveal Niokana Headliner from among them and put it into your hand.

Flash
Flying
Other creatures you control with flying get +1/+0.

Nobles you control get +1/+1 and have ward {1}.
{B}{W}: Level 2
When this Class becomes level 2, you may search your library for a Noble card, reveal it, put it into your hand, then shuffle.
{1}{B}{W}: Level 3
When this Class becomes level 3, each opponent loses 3 life and you gain 3 life.

Indulgence
Whenever you indulge, you may put a toxin counter on target creature an opponent controls. Surveil 1.
Creatures your opponents control get -1/-1 for each toxin counter on them.

Whenever another creature you control enters, Nomad's Companion gets +1/+1 until end of turn.

Enchant creature
Enchanted creature gets +2/+1.
{2}{B}, Discard a card: Enchanted creature gains indestructible until end of turn. Tap it.

Whenever you gain life, put a +1/+1 counter on Nourishing Orator.
{2}{G}{W}: Nourishing Orator gains lifelink until end of turn.

If you would gain life, you gain that much life plus 1 instead.
If one or more tokens would be created under your control, those tokens plus a 0/1 white Goat creature token are created instead.

Reach, lifelink

Nykthos, Architect of Gods has indestructible as long as you control at least three Shrines.
Whenever Nykthos attacks, you may pay {W}{U}{B}{R}{G}. If you do, search your library for a Shrine or legendary land card, put it onto the battlefield, then shuffle.

If you would add mana of a color to your mana pool, you may instead add an amount equal to your devotion to that color instead.

Whenever Nyxborn Retriever attacks, if defending player has eight or more cards in their graveyard, Nyxborn Retriever gets +2/+1 and gains menace until end of turn.

Enchant creature
Enchanted creature has “Whenever this creature deals combat damage to a player or planeswalker, scry 1, then draw a card.”

Flying
Odunos Smuggler can't block.
When Odunos Smuggler enters, target player mills two cards. Scry 2.

At the beginning of your upkeep, integrate the top card of target player's library.
Whenever a creature card is integrated onto Offerings to Sky Gods, create a 1/1 colorless Cyborg artifact creature token.

Menace
When Ogre Gourmand enters, create a Food token.

Lifelink
{2}{W}: Ogre of the Gilded Halls gains indestructible until end of turn. Tap it.

Whenever an enchantment you control enters, each opponent mills two cards.