Have

Cloud Sprite

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

Merfolk of the Pearl Trident

Master Thief

When this creature enters, gain control of target artifact for as long as you control this creature.

Sage Owl

Flying
When this creature enters, look at the top four cards of your library, then put them back in any order.

Man-o'-War

When this creature enters, return target creature to its owner's hand.

Stealer of Secrets

Whenever this creature deals combat damage to a player, draw a card.

Messenger Drake

Flying
When this creature dies, draw a card.

Amphin Cutthroat

Air Elemental

Merfolk Observer

When this creature enters, look at the top card of target player's library.

Kraken Hatchling

Air Servant

Flying
{2}{U}: Tap target creature with flying.

Scroll Thief

Wanderguard Sentry

When this creature enters, look at target opponent's hand.

Cathartic Adept

Trained Condor

Flying
Whenever this creature attacks, another target creature you control gains flying until end of turn.

Surrakar Banisher

When this creature enters, you may return target tapped creature to its owner's hand.

Frostwind Invoker

Flying
{8}: Creatures you control gain flying until end of turn.

Alluring Siren

{T}: Target creature an opponent controls attacks you this turn if able.

Thornwind Faeries

Flying
{T}: This creature deals 1 damage to any target.

Outrider of Jhess

Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)

Thieving Magpie

Flying (This creature can't be blocked except by creatures with flying or reach.)
Whenever this creature deals damage to an opponent, draw a card.

Snapping Drake

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

Wall of Air

Defender, flying (This creature can't attack, and it can block creatures with flying.)

Watercourser

{U}: This creature gets +1/-1 until end of turn.

Water Servant

{U}: This creature gets +1/-1 until end of turn.
{U}: This creature gets -1/+1 until end of turn.

Cloud Elemental

Flying
This creature can block only creatures with flying.

Armored Cancrix

Aven Fisher

Flying (This creature can't be blocked except by creatures with flying or reach.)
When this creature dies, you may draw a card.

Augury Owl

Flying
When this creature enters, scry 3. (Look at the top three cards of your library, then put any number of them on the bottom and the rest on top in any order.)

Elite Arcanist

When this creature enters, you may exile an instant card from your hand.
{X}, {T}: Copy the exiled card. You may cast the copy without paying its mana cost. X is the mana value of the exiled card.

Dream Thief

Flying
When this creature enters, draw a card if you've cast another blue spell this turn.

Void Stalker

{2}{U}, {T}: Put this creature and target creature on top of their owners' libraries, then those players shuffle their libraries.

Aven Windreader

Flying (This creature can't be blocked except by creatures with flying or reach.)
{1}{U}: Target player reveals the top card of their library.

Body Double

You may have this creature enter as a copy of any creature card in a graveyard.

Illusionary Servant

Flying
When this creature becomes the target of a spell or ability, sacrifice it.

Skywinder Drake

Merfolk Looter

Merfolk Mesmerist

Wonder

Flying
As long as this card is in your graveyard and you control an Island, creatures you control have flying.

Djinn of Wishes

Flying
This creature enters with three wish counters on it.
{2}{U}{U}, Remove a wish counter from this creature: Reveal the top card of your library. You may play that card without paying its mana cost. If you don't, exile it.

Aven Fleetwing

Flying
Hexproof (This creature can't be the target of spells or abilities your opponents control.)