Whenever Aerial Guide attacks, another target attacking creature gains flying until end of turn.
2 /
2
{1}{U}
Aether Tunnel
Enchantment - Aura
Enchant creature
Enchanted creature gets +1/+0 and can't be blocked.
{1}{U}
Anticipate
Instant
Look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.
{2}{U}
Arrester's Admonition
Instant
Return target creature to its owner's hand.
Addendum -- If you cast this spell during your main phase, draw a card.
{4}{U}
Ashiok's Skulker
Creature - Nightmare
{3}{U}: Ashiok's Skulker can't be blocked this turn.
3 /
5
{1}{U}
Augur of Bolas
Creature - Merfolk Wizard
When Augur of Bolas enters the battlefield, look at the top three cards of your library. You may reveal an instant or sorcery card from among them and put it into your hand. Put the rest on the bottom of your library in any order.
1 /
3
{2}{U}
Aven Wind Mage
Creature - Bird Wizard
Flying
Whenever you cast an instant or sorcery spell, Aven Wind Mage gets +1/+1 until end of turn.
2 /
2
{2}{U}
Aviation Pioneer
Creature - Human Artificer
When Aviation Pioneer enters the battlefield, create a 1/1 colorless Thopter artifact creature token with flying.
1 /
2
{2}{U}
Befuddle
Instant
Target creature gets -4/-0 until end of turn.
Draw a card.
{1}{U}
Blink of an Eye
Instant
Kicker {1}{U} (You may pay an additional {1}{U} as you cast this spell.)
Return target nonland permanent to its owner's hand. If this spell was kicked, draw a card.
{2}{U}{U}
Bone to Ash
Instant
Counter target creature spell.
Draw a card.
{3}{U}
Breaching Hippocamp
Creature - Horse Fish
Flash (You may cast this spell any time you could cast an instant.)
When Breaching Hippocamp enters the battlefield, untap another target creature you control.
3 /
2
{6}{U}
Brine Giant
Creature - Giant
This spell costs {1} less to cast for each enchantment you control.
5 /
6
{U}
Brinebarrow Intruder
Creature - Human Rogue
Flash
When Brinebarrow Intruder enters the battlefield, target creature an opponent controls gets -2/-0 until end of turn.
1 /
2
{U}
Bubble Snare
Enchantment - Aura
Kicker {2}{U} (You may pay an additional {2}{U} as you cast this spell.)
Enchant creature
When Bubble Snare enters the battlefield, if it was kicked, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.
{1}{U}{U}
Cackling Counterpart
Instant
Create a token that's a copy of target creature you control.
Flashback {5}{U}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
{1}{U}{U}
Cancel
Instant
Counter target spell.
{1}{U}
Cartouche of Knowledge
Enchantment - Aura Cartouche
Enchant creature you control
When Cartouche of Knowledge enters the battlefield, draw a card.
Enchanted creature gets +1/+1 and has flying.
--
Castle Vantress
Land
Castle Vantress enters the battlefield tapped unless you control an Island.
{T}: Add {U}.
{2}{U}{U}, {T}: Scry 2.
{2}{U}
Clear the Mind
Sorcery
Target player shuffles their graveyard into their library.
Draw a card.
{2}{U}
Cloudkin Seer
Creature - Elemental Wizard
Flying
When Cloudkin Seer enters the battlefield, draw a card.
2 /
1
{2}{U}
Code of Constraint
Instant
Target creature gets -4/-0 until end of turn.
Draw a card.
Addendum -- If you cast this spell during your main phase, tap that creature and it doesn't untap during its controller's next untap step.
{5}{U}
Cold-Water Snapper
Creature - Turtle
Hexproof (This creature can't be the target of spells or abilities your opponents control.)
4 /
5
{5}{U}{U}
Cryptic Serpent
Creature - Serpent
This spell costs {1} less to cast for each instant and sorcery card in your graveyard.
6 /
5
{3}{U}
Deadeye Rig-Hauler
Creature - Human Pirate
Raid -- When Deadeye Rig-Hauler enters the battlefield, if you attacked this turn, you may return target creature to its owner's hand.
3 /
2
{1}{U}
Deduce
Instant
Draw a card. Investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")
{2}{U}
Divination
Sorcery
Draw two cards.
{1}{U}
Drowned Secrets
Enchantment
Whenever you cast a blue spell, target player mills two cards.
{2}{U}{U}
Dungeon Geists
Creature - Spirit
Flying
When Dungeon Geists enters the battlefield, tap target creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control Dungeon Geists.
3 /
3
{1}{U}
Eaten by Piranhas
Enchantment - Aura
Flash
Enchant creature
Enchanted creature loses all abilities and is a black Skeleton creature with base power and toughness 1/1. (It loses all other card types and creature types.)
{2}{U}
Exclude
Instant
Counter target creature spell.
Draw a card.
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Lonely Sandbar
Land
Lonely Sandbar enters the battlefield tapped.
{T}: Add {U}.
Cycling {U} ({U}, Discard this card: Draw a card.)
{2}
Rogue's Gloves
Artifact - Equipment
Whenever equipped creature deals combat damage to a player, you may draw a card.
Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)
{2}{U}
Stealth Mission
Sorcery
Put two +1/+1 counters on target creature you control. That creature can't be blocked this turn.