Enchanted creature has shroud. (It can't be the target of spells or abilities.)
{2}{U}{U}
Bident of Thassa
Legendary Enchantment Artifact
Whenever a creature you control deals combat damage to a player, you may draw a card.
{1}{U}, {T}: Creatures your opponents control attack this turn if able.
{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.
{2}{U}
Chant of the Skifsang
Enchantment - Aura
Enchant creature
Enchanted creature gets -13/-0.
{3}{U}
Cloaked Siren
Creature - Siren
Flash (You may cast this spell any time you could cast an instant.)
Flying
3 /
2
{3}{U}
Clone
Creature - Shapeshifter
You may have Clone enter the battlefield as a copy of any creature on the battlefield.
0 /
0
{2}{U}{U}
Control Magic
Enchantment - Aura
Enchant creature
You control enchanted creature.
{U}{U}
Counterspell
Instant
Counter target spell.
{5}
Creepy Doll
Artifact Creature - Construct
Indestructible
Whenever Creepy Doll deals combat damage to a creature, flip a coin. If you win the flip, destroy that creature.
1 /
1
{2}{U}
Curse of Inertia
Enchantment - Aura Curse
Enchant player
Whenever a player attacks enchanted player with one or more creatures, that attacking player may tap or untap target permanent of their choice.
{6}{U}
Dismiss into Dream
Enchantment
Each creature your opponents control is an Illusion in addition to its other types and has "When this creature becomes the target of a spell or ability, sacrifice it."
{1}{U}{U}
Dissipate
Instant
Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.
{1}{U}{U}
Dissolve
Instant
Counter target spell. Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)
{2}{U}
Dream Fighter
Creature - Human Soldier
Whenever Dream Fighter blocks or becomes blocked by a creature, Dream Fighter and that creature phase out. (While they're phased out, they're treated as though they don't exist. Each one phases in before its controller untaps during their next untap step.)
1 /
1
{1}{U}{U}
Dream Fracture
Instant
Counter target spell. Its controller draws a card.
Draw a card.
{7}
Elbrus, the Binding Blade
Legendary Artifact - Equipment
Equipped creature gets +1/+0.
When equipped creature deals combat damage to a player, unattach Elbrus, the Binding Blade, then transform it.
Equip {1}
--
Withengar Unbound
Legendary Creature - Demon
Flying, intimidate, trample (A creature with intimidate can't be blocked except by artifact creatures and/or creatures that share a color with it.)
Whenever a player loses the game, put thirteen +1/+1 counters on Withengar Unbound.
{U}
Enchantment Alteration
Instant
Attach target Aura attached to a creature or land to another permanent of that type.
{1}{U}{U}
Faerie Trickery
Tribal Instant - Faerie
Counter target non-Faerie spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.
{2}{U}
Frost Lynx
Creature - Elemental Cat
When Frost Lynx enters the battlefield, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.
2 /
2
--
Halimar Depths
Land
Halimar Depths enters the battlefield tapped.
When Halimar Depths enters the battlefield, look at the top three cards of your library, then put them back in any order.
{T}: Add {U}.
{1}{U}
Hands of Binding
Sorcery
Tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.
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.)
{1}{U}
Hidden Strings
Sorcery
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.)
{1}{U}{U}
Hinder
Instant
Counter target spell. If that spell is countered this way, put that card on the top or bottom of its owner's library instead of into that player's graveyard.
{2}{U}
Hydromorph Guardian
Creature - Elemental
{U}, Sacrifice Hydromorph Guardian: Counter target spell that targets a creature you control.
2 /
2
{1}{U}
Inaction Injunction
Sorcery
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.
{2}
Inquisitor's Flail
Artifact - Equipment
If equipped creature would deal combat damage, it deals double that damage instead.
If another creature would deal combat damage to equipped creature, it deals double that damage to equipped creature instead.
Equip {2}
--
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}.)
--
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}.)
{3}{U}{U}
Ixidron
Creature - Illusion
As Ixidron enters the battlefield, turn all other nontoken creatures face down. (They're 2/2 creatures.)
Ixidron's power and toughness are each equal to the number of face-down creatures on the battlefield.
* /
*
{5}{U}{U}
Kraken of the Straits
Creature - Kraken
Creatures with power less than the number of Islands you control can't block Kraken of the Straits.
6 /
6
{2}{U}
Man-o'-War
Creature - Jellyfish
When Man-o'-War enters the battlefield, return target creature to its owner's hand.
2 /
2
{3}{U}
Marchesa's Emissary
Creature - Human Rogue
Hexproof (This creature can't be the target of spells or abilities your opponents control.)
Dethrone (Whenever this creature attacks the player with the most life or tied for most life, put a +1/+1 counter on it.)
2 /
2
{2}{U}
Marchesa's Infiltrator
Creature - Human Rogue
Dethrone (Whenever this creature attacks the player with the most life or tied for most life, put a +1/+1 counter on it.)
Whenever Marchesa's Infiltrator deals combat damage to a player, draw a card.
1 /
1
{2}
Mask of Avacyn
Artifact - Equipment
Equipped creature gets +1/+2 and has hexproof. (It can't be the target of spells or abilities your opponents control.)
Equip {3}
{3}{U}
Master of Waves
Creature - Merfolk Wizard
Protection from red
Elemental creatures you control get +1/+1.
When Master of Waves enters the battlefield, create a number of 1/0 blue Elemental creature tokens equal to your devotion to blue. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.)
2 /
1
{U}
Mizzium Skin
Instant
Target creature you control gets +0/+1 and gains hexproof until end of turn.
Overload {1}{U} (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")
{2}{U}
Nimbus Naiad
Enchantment Creature - Nymph
Bestow {4}{U} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)
Flying
Enchanted creature gets +2/+2 and has flying.
2 /
2
{3}{U}
Paragon of Gathering Mists
Creature - Human Wizard
Other blue creatures you control get +1/+1.
{U}, {T}: Another target blue creature you control gains flying until end of turn.
2 /
2
{3}
Quietus Spike
Artifact - Equipment
Equipped creature has deathtouch.
Whenever equipped creature deals combat damage to a player, that player loses half their life, rounded up.
Equip {3}
{1}{U}
Reality Shift
Instant
Exile target creature. Its controller manifests the top card of their library. (That player puts the top card of their library onto the battlefield face down as a 2/2 creature. If it's a creature card, it can be turned face up any time for its mana cost.)
{2}{U}{U}
Reins of Power
Instant
Untap all creatures you control and all creatures target opponent controls. You and that opponent each gain control of all creatures the other controls until end of turn. Those creatures gain haste until end of turn.
{2}{U}
Rhystic Study
Enchantment
Whenever an opponent casts a spell, you may draw a card unless that player pays {1}.
--
Saprazzan Skerry
Land
Saprazzan Skerry enters the battlefield tapped with two depletion counters on it.
{T}, Remove a depletion counter from Saprazzan Skerry: Add {U}{U}. If there are no depletion counters on Saprazzan Skerry, sacrifice it.
{5}{U}{U}
Scourge of Fleets
Creature - Kraken
When Scourge of Fleets enters the battlefield, return each creature your opponents control with toughness X or less to its owner's hand, where X is the number of Islands you control.
6 /
6
{4}{U}{U}
Sharding Sphinx
Artifact Creature - Sphinx
Flying
Whenever an artifact creature you control deals combat damage to a player, you may create a 1/1 blue Thopter artifact creature token with flying.
4 /
4
{4}{U}{U}
Shipbreaker Kraken
Creature - Kraken
{6}{U}{U}: Monstrosity 4. (If this creature isn't monstrous, put four +1/+1 counters on it and it becomes monstrous.)
When Shipbreaker Kraken becomes monstrous, tap up to four target creatures. Those creatures don't untap during their controllers' untap steps for as long as you control Shipbreaker Kraken.
6 /
6
{5}{U}{U}{U}
Stormtide Leviathan
Creature - Leviathan
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
All lands are Islands in addition to their other types.
Creatures without flying or islandwalk can't attack.
8 /
8
{4}{U}{U}
Supplant Form
Instant
Return target creature to its owner's hand. You create a token that's a copy of that creature.
{6}{U}
Supreme Exemplar
Creature - Elemental
Flying
Champion an Elemental (When this enters the battlefield, sacrifice it unless you exile another Elemental you control. When this leaves the battlefield, that card returns to the battlefield.)
10 /
10
{2}{U}
Thalakos Mistfolk
Creature - Thalakos Illusion
Shadow (This creature can block or be blocked by only creatures with shadow.)
{U}: Put Thalakos Mistfolk on top of its owner's library.
2 /
1
{3}{U}
Thassa's Emissary
Enchantment Creature - Crab
Bestow {5}{U} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)
Whenever Thassa's Emissary or enchanted creature deals combat damage to a player, draw a card.
Enchanted creature gets +3/+3.
3 /
3
{2}{U}
Thassa, God of the Sea
Legendary Enchantment Creature - God
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.
5 /
5
{4}{U}{U}
Thousand Winds
Creature - Elemental
Flying
Morph {5}{U}{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.)
When Thousand Winds is turned face up, return all other tapped creatures to their owners' hands.
5 /
6
{5}{U}{U}{U}
Tidal Force
Creature - Elemental
At the beginning of each upkeep, you may tap or untap target permanent.
7 /
7
{U}
Triton Shorestalker
Creature - Merfolk Rogue
Triton Shorestalker can't be blocked.
1 /
1
{U}
Unsummon
Instant
Return target creature to its owner's hand.
{U}
Vanishing
Enchantment - Aura
Enchant creature
{U}{U}: Enchanted creature phases out. (While it's phased out, it's treated as though it doesn't exist. It phases in before its controller untaps during their next untap step.)
{U}
Vortex Elemental
Creature - Elemental
{U}: Put Vortex Elemental and each creature blocking or blocked by it on top of their owners' libraries, then those players shuffle.
{3}{U}{U}: Target creature blocks Vortex Elemental this turn if able.
0 /
1
{1}{U}{U}
Wall of Air
Creature - Wall
Defender, flying (This creature can't attack, and it can block creatures with flying.)
1 /
5
{3}{U}
Wash Out
Sorcery
Return all permanents of the color of your choice to their owners' hands.
{2}{U}{U}
Water Servant
Creature - Elemental
{U}: Water Servant gets +1/-1 until end of turn.
{U}: Water Servant gets -1/+1 until end of turn.
3 /
4
{2}{U}{U}{U}
Future Sight
Enchantment
Play with the top card of your library revealed.
You may play lands and cast spells from the top of your library.
{3}{U}
Llawan, Cephalid Empress
Legendary Creature - Cephalid Noble
When Llawan, Cephalid Empress enters the battlefield, return all blue creatures your opponents control to their owners' hands.
Your opponents can't cast blue creature spells.
2 /
3
{U}
Sleight of Mind
Instant
Change the text of target spell or permanent by replacing all instances of one color word with another. (For example, you may change "target black spell" to "target blue spell." This effect lasts indefinitely.)
{5}{U}
Spelltwine
Sorcery
Exile target instant or sorcery card from your graveyard and target instant or sorcery card from an opponent's graveyard. Copy those cards. Cast the copies if able without paying their mana costs. Exile Spelltwine.