Have

Man-o'-War

When Man-o'-War enters, return target creature to its owner's hand.

Alluring Siren

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

Illusionary Servant

Flying
When Illusionary Servant becomes the target of a spell or ability, sacrifice it.

Scroll Thief

Whenever Scroll Thief deals combat damage to a player, draw a card.

Aven Fleetwing

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

Sage Owl

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

Air Servant

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

Merfolk Observer

When Merfolk Observer enters, look at the top card of target player's library.

Void Stalker

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

Merfolk Mesmerist

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.

Wonder

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

Frostwind Invoker

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

Fortress Crab

Master Thief

When Master Thief enters, gain control of target artifact for as long as you control Master Thief.

Jhessian Lookout

Dream Thief

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

Merfolk Looter

Kraken Hatchling

Air Elemental

Wall of Air

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

Augury Owl

Flying
When Augury Owl 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 Elite Arcanist 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.

Stealer of Secrets

Whenever Stealer of Secrets deals combat damage to a player, draw a card.

Mindeye Drake

Flying
When Mindeye Drake dies, target player mills five cards.

Wanderguard Sentry

When Wanderguard Sentry enters, look at target opponent's hand.

Body Double

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

Cloud Sprite

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

Merfolk of the Pearl Trident

Thieving Magpie

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

Armored Cancrix

Djinn of Wishes

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

Outrider of Jhess

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

Cloud Elemental

Flying
Cloud Elemental can block only creatures with flying.

Water Servant

{U}: Water Servant gets +1/-1 until end of turn.
{U}: Water Servant gets -1/+1 until end of turn.

Seacoast Drake

Watercourser

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

Amphin Cutthroat

Trained Condor

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

Cathartic Adept

Messenger Drake

Flying
When Messenger Drake dies, draw a card.

Skywinder Drake

Flying
Skywinder Drake can block only creatures with flying.

Wandering Ones

Snapping Drake

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

Thornwind Faeries

Flying
{T}: Thornwind Faeries deals 1 damage to any target.

Aven Fisher

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

Surrakar Banisher

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