Flying
At the beginning of each combat, choose first strike, vigilance, or lifelink. Creatures you control gain that ability until end of turn.

Flying
Whenever another permanent you control leaves the battlefield, if it had counters on it, investigate.

Defender
Flying

, , Sacrifice a green creature, a white creature, and a blue creature: Search your library for a card named Empyrial Archangel, put it onto the battlefield, then shuffle.

Lifelink
: This creature gets +3/+3 until end of turn.

Vigilance
As this creature enters, look at an opponent's hand, then choose any card name.
Spells your opponents cast with the chosen name cost more to cast.
Activated abilities of sources with the chosen name cost more to activate unless they're mana abilities.

: Target attacking creature gets +1/+1 until end of turn.

Flying
Whenever a creature attacks, you may pay . When you do, put a +1/+1 counter on that creature.

Whenever a creature token you control enters, you gain 1 life.
Embalm

When Anti-Venom enters, if he was cast, return target creature card from your graveyard to the battlefield.
If damage would be dealt to Anti-Venom, prevent that damage and put that many +1/+1 counters on him.

: Put a +1/+1 counter on Ant-Man.

Flying, vigilance
When Ao dies, choose one —
• Look at the top seven cards of your library. Put any number of nonland permanent cards with total mana value 4 or less from among them onto the battlefield. Put the rest on the bottom of your library in a random order.
• Put two +1/+1 counters on each permanent you control that's a creature or Vehicle.

First strike, lifelink
Ascend
At the beginning of your end step, if you gained life this turn, create a 1/1 white Cat creature token. Then if you have the city's blessing, for each token you control that entered the battlefield this turn, create a token that's a copy of it.

Multikicker
Flying
This creature enters with a +1/+1 counter on it for each time it was kicked.

Flying
Corrupted — As long as an opponent has three or more poison counters, this creature has double strike.

Protection from black
: Exile target card from a graveyard.

Flying
When this creature enters, if you control another Spirit, you gain 3 life.

Whenever a player casts a white spell, you may pay . If you do, you gain 1 life.

Vigilance
Whenever you attack, you create a Food token for each player being attacked.
, , Tap X untapped Foods you control: Create X 1/1 white Human creature tokens.

Flying
Whenever Appa attacks, another target attacking creature without flying gains flying until end of turn.

Flying
Whenever Appa enters or attacks, choose one —
• Target creature you control gains flying until end of turn.
• Airbend another target nonland permanent you control.

Flash
Flying
When Appa enters, airbend any number of other target nonland permanents you control.
Whenever you cast a spell from exile, create a 1/1 white Ally creature token.

Flying, vigilance
Whenever Appa or another Ally you control enters, creatures you control get +1/+1 and gain flying and vigilance until end of turn.

When April O'Neil enters, scry 2.
April O'Neil can't be blocked by creatures with power 3 or greater.

Flying
Bushido 1

Web-slinging
As Arachne enters, look at an opponent's hand, then choose a card type other than creature.
Spells of the chosen type cost more to cast.

Enlist
Whenever a creature you control attacks, if it enlisted a creature this combat, the creature that attacked gains double strike until end of turn. If that creature's power is 4 or greater, draw a card.

Other Cats you control get +1/+1.
Whenever Arahbo or another nontoken Cat you control enters, create a 1/1 white Cat creature token.

When this creature enters, you gain 3 life.

Double strike
Whenever this creature enters or attacks, another target Warrior creature you control gains double strike until end of turn.