Isperia's Skywatch

Flying
When this creature enters, detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)

Mistral Singer

Flying
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Disdainful Stroke

Counter target spell with mana value 4 or greater.

Time Ebb

Put target creature on top of its owner's library.

Shriekgeist

Flying
Whenever this creature deals combat damage to a player, that player mills two cards.

Tide Skimmer

Flying
Whenever you attack with two or more creatures with flying, draw a card.

Ice Over

Enchant artifact or creature
Enchanted permanent doesn't untap during its controller's untap step.

Hidden Strings

You may tap or untap target permanent, then you may tap or untap another target permanent.
Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.)

Lumengrid Sentinel

Flying
Whenever an artifact you control enters, you may tap target permanent.

Messenger Drake

Flying
When this creature dies, draw a card.

Nullify

Aven Wind Mage

Flying
Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn.

Thassa, God of the Sea

Indestructible
As long as your devotion to blue is less than five, Thassa isn't a creature. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.)
At the beginning of your upkeep, scry 1.
{1}{U}: Target creature you control can't be blocked this turn.

Unsummon

Return target creature to its owner's hand.

Downsize

Target creature you don't control gets -4/-0 until end of turn.
Overload {2}{U} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

Blustersquall

Tap target creature you don't control.
Overload {3}{U} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

Warden of Evos Isle

Flying
Creature spells with flying you cast cost {1} less to cast.

Inaction Injunction

Detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)
Draw a card.

Air Elemental

Prescient Chimera

Flying
Whenever you cast an instant or sorcery spell, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Lofty Denial

Counter target spell unless its controller pays {1}. If you control a creature with flying, counter that spell unless its controller pays {4} instead.

Disperse

Return target nonland permanent to its owner's hand.

Illusory Wrappings

Enchant creature
Enchanted creature has base power and toughness 0/2.

Negate

Scribe of the Mindful

{1}, {T}, Sacrifice this creature: Return target instant or sorcery card from your graveyard to your hand.

Contempt

Enchant creature
When enchanted creature attacks, return it and this Aura to their owners' hands at end of combat.

Spell Rupture

Counter target spell unless its controller pays {X}, where X is the greatest power among creatures you control.

Horizon Scholar

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

Spell Contortion

Multikicker {1}{U} (You may pay an additional {1}{U} any number of times as you cast this spell.)
Counter target spell unless its controller pays {2}. Draw a card for each time Spell Contortion was kicked.

Vedalken Certarch

Metalcraft — {T}: Tap target artifact, creature, or land. Activate only if you control three or more artifacts.

Voidwielder

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

Soulsworn Spirit

This creature can't be blocked.
When this creature enters, detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)

Moon Heron

Screeching Silcaw

Flying
Metalcraft — Whenever this creature deals combat damage to a player, if you control three or more artifacts, that player mills four cards.

Essence Scatter

Dispersal Technician

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

Wind Drake

Sky-Eel School

Flying
When this creature enters, draw a card, then discard a card.

Nephalia Seakite

Flash (You may cast this spell any time you could cast an instant.)
Flying

Read the Tides

Choose one —
• Draw three cards.
• Return up to two target creatures to their owners' hands.

Snapping Drake

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

Mirran Spy

Flying
Whenever you cast an artifact spell, you may untap target creature.

Dwindle

Enchant creature
Enchanted creature gets -6/-0.
When enchanted creature blocks, destroy it. (The attacking creature remains blocked.)

Vexing Gull

Skywinder Drake

Flying
This creature can block only creatures with flying.

Leyline Phantom

When this creature deals combat damage, return it to its owner's hand. (Return it only if it survived combat.)

Aven Initiate

Flying
Embalm {6}{U} ({6}{U}, Exile this card from your graveyard: Create a token that's a copy of it, except it's a white Zombie Bird Warrior with no mana cost. Embalm only as a sorcery.)

Take into Custody

Tap target creature. It doesn't untap during its controller's next untap step.

Frost Breath

Tap up to two target creatures. Those creatures don't untap during their controller's next untap step.