Fellwar Stone

{T}: Add one mana of any color that a land an opponent controls could produce.

Skywing Aven

Flying
Discard a card: Return Skywing Aven to its owner's hand.

Coastal Hornclaw

Sacrifice a land: Coastal Hornclaw gains flying until end of turn.

Robe of Mirrors

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
Enchanted creature has shroud. (It can't be the target of spells or abilities.)

Sea Scryer

Terminal Moraine

{T}: Add {C}.
{2}, {T}, Sacrifice Terminal Moraine: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Brainstorm

Draw three cards, then put two cards from your hand on top of your library in any order.

Stormscape Familiar

Flying
White spells and black spells you cast cost {1} less to cast.

Thornwind Faeries

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

Counterspell

Mistform Seaswift

Flying
{1}: Mistform Seaswift becomes the creature type of your choice until end of turn.
Morph {1}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Power Sink

Counter target spell unless its controller pays {X}. If that player doesn't, they tap all lands with mana abilities they control and lose all unspent mana.

Mistform Wall

Mistform Wall has defender as long as it's a Wall.
{1}: Mistform Wall becomes the creature type of your choice until end of turn.

Ascending Aven

Flying
Ascending Aven can block only creatures with flying.
Morph {2}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Peregrine Drake

Flying
When Peregrine Drake enters, untap up to five lands.

Abjure

As an additional cost to cast this spell, sacrifice a blue permanent.
Counter target spell.

Sleight of Hand

Look at the top two cards of your library. Put one of them into your hand and the other on the bottom of your library.

Memory Lapse

Counter target spell. If that spell is countered this way, put it on top of its owner's library instead of into that player's graveyard.

Dream Thrush

Flying
{T}: Target land becomes the basic land type of your choice until end of turn.

Sage Owl

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

Lonely Sandbar

Lonely Sandbar enters tapped.
{T}: Add {U}.
Cycling {U} ({U}, Discard this card: Draw a card.)

Aesthir Glider

Shoreline Ranger

Flying
Islandcycling {2} ({2}, Discard this card: Search your library for an Island card, reveal it, put it into your hand, then shuffle.)

Capsize

Buyback {3} (You may pay an additional {3} as you cast this spell. If you do, put this card into your hand as it resolves.)
Return target permanent to its owner's hand.

Impulse

Look at the top four cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.

Aven Envoy

Deep Analysis

Target player draws two cards.
Flashback—{1}{U}, Pay 3 life. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Unsummon

Return target creature to its owner's hand.

Stormwatch Eagle

Flying
Sacrifice a land: Return Stormwatch Eagle to its owner's hand.

Apprentice Wizard

Covert Operative

Keeneye Aven

Flying
Cycling {2} ({2}, Discard this card: Draw a card.)

Sky Diamond

Repulse

Return target creature to its owner's hand.
Draw a card.

Airborne Aid

Draw a card for each Bird on the battlefield.

Sigil of Sleep

Enchant creature
Whenever enchanted creature deals damage to a player, return target creature that player controls to its owner's hand.

Sunken City

At the beginning of your upkeep, sacrifice Sunken City unless you pay {U}{U}.
Blue creatures get +1/+1.

Foil

You may discard an Island card and another card rather than pay this spell's mana cost.
Counter target spell.

Giant Albatross

Flying
When Giant Albatross dies, you may pay {1}{U}. If you do, for each creature that dealt damage to Giant Albatross this turn, destroy that creature unless its controller pays 2 life. A creature destroyed this way can't be regenerated.

Manakin

Prohibit

Kicker {2} (You may pay an additional {2} as you cast this spell.)
Counter target spell if its mana value is 2 or less. If this spell was kicked, counter that spell if its mana value is 4 or less instead.

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.

Mistform Dreamer

Flying
{1}: Mistform Dreamer becomes the creature type of your choice until end of turn.

Kingfisher

Flying
When Kingfisher dies, draw a card.

Remote Isle

Remote Isle enters tapped.
{T}: Add {U}.
Cycling {2} ({2}, Discard this card: Draw a card.)

Storm Crow

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

Remove Soul

Spire Owl

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

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.

Waterfront Bouncer

{U}, {T}, Discard a card: Return target creature to its owner's hand.

Mercurial Kite

Flying
Whenever Mercurial Kite deals combat damage to a creature, tap that creature. That creature doesn't untap during its controller's next untap step.

Veil of Birds

When an opponent casts a spell, if Veil of Birds is an enchantment, Veil of Birds becomes a 1/1 Bird creature with flying.

Killer Whale

{U}: Killer Whale gains flying until end of turn.

Inspiration

Bay Falcon

Zephyr Falcon

Mind Stone

{T}: Add {C}.
{1}, {T}, Sacrifice Mind Stone: Draw a card.

Scry 1. (Look at the top card of your library. You may put that card on the bottom.)
Draw a card.

Ghost Ship

Aven Fogbringer

Flying
When Aven Fogbringer enters, return target land to its owner's hand.

Seal of Removal

Sacrifice Seal of Removal: Return target creature to its owner's hand.

Crookclaw Elder

Flying
Tap two untapped Birds you control: Draw a card.
Tap two untapped Wizards you control: Target creature gains flying until end of turn.

Exclude

Counter target creature spell.
Draw a card.

Star Compass

Star Compass enters tapped.
{T}: Add one mana of any color that a basic land you control could produce.