Hexproof Creatures your opponents control attack each combat if able.

Flash Flying When Crookclaw Transmuter enters the battlefield, switch target creature's power and toughness until end of turn.

Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.) {3}{U}{U}: Dreadlight Monstrosity can't be blocked this turn. Activate only if you own a card in exile.

Vigilance {1}{U}: Hermitic Nautilus gets +3/-3 until end of turn.

{T}: Switch target creature's power and toughness until end of turn.

Flash Defender

{2}{U}: Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

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.

Enchant creature Enchanted creature has "Whenever this creature deals combat damage to a player, draw a card." As long as enchanted creature is legendary, it gets +1/+1 and has ward {1}. (Whenever enchanted creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {1}.)

When Confounding Conundrum enters the battlefield, draw a card. Whenever a land enters the battlefield under an opponent's control, if that player had another land enter the battlefield under their control this turn, they return a land they control to its owner's hand.

Enchant creature Whenever enchanted creature deals damage to an opponent, you may draw a card.

Scry 2, then draw a card.

Draw a card for each Island you control, then discard two cards.

Scry 1. Draw a card.

When Purple-Crystal Crab dies, draw a card.

Whenever a creature you control deals combat damage to a player, you may draw a card. Cycling {2} ({2}, Discard this card: Draw a card.)

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.

Enchant creature Enchanted creature can't be blocked. Whenever enchanted creature attacks, scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

Whenever Mistford River Turtle attacks, another target attacking non-Human creature can't be blocked this turn.

+2: Target creature can't be blocked this turn. −3: Draw two cards. −10: Tap all creatures your opponents control. You take an extra turn after this one.

({T}: Add {U}.)

{T}: Add {C}. {4}, {T}: Target creature can't be blocked this turn.

Callaphe's power is equal to your devotion to blue. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.) Creatures and enchantments you control have "Spells your opponents cast that target this permanent cost {1} more to cast."

Enchant creature {2}{U}: Untap enchanted creature. Totem armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)

Target creature you control gets +0/+3 and gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)

+2: Until your next turn, up to one target creature gets -2/-0 and loses flying. −3: Create a 4/4 blue Elemental Bird creature token with flying. −8: You get an emblem with "Islands you control have '{T}: Draw a card.'"

{2}: Equipped creature gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.) At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's blue. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

Target creature you control gets +1/+1 and gains hexproof until end of turn. Untap it. (It can't be the target of spells or abilities your opponents control.)

{T}: Add {U}. {2}{U}: Put an hour counter on Midnight Clock. At the beginning of each upkeep, put an hour counter on Midnight Clock. When the twelfth hour counter is put on Midnight Clock, shuffle your hand and graveyard into your library, then draw seven cards. Exile Midnight Clock.

{T}: Add {C}{C}.

Return six target nonland permanents to their owners' hands.

When Amphin Mutineer enters the battlefield, exile up to one target non-Salamander creature. That creature's controller creates a 4/3 blue Salamander Warrior creature token. Encore {4}{U}{U} ({4}{U}{U}, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)

When Brinelin, the Moon Kraken enters the battlefield or whenever you cast a spell with mana value 6 or greater, you may return target nonland permanent to its owner's hand. Partner (You can have two commanders if both have partner.)

Morph {4}{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 Chromeshell Crab is turned face up, you may exchange control of target creature you control and target creature an opponent controls.

Each player chooses a nonland permanent they control. Return all nonland permanents not chosen this way to their owners' hands. Then you draw a card for each opponent who has more cards in their hand than you.

Counter target spell with mana value 4 or greater.

Return to their owners' hands all creatures with toughness less than or equal to the number of Islands you control.

Return all noncreature, nonland permanents to their owners' hands.

Return all nonland permanents to their owners' hands. If you return four or more nontoken permanents you control this way, you may put a permanent card from your hand onto the battlefield.

Flash This spell can't be countered. Whenever you cast a spell, choose up to one — • Return target spell you don't control to its owner's hand. • Return target nonland permanent to its owner's hand.

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.

Ward {3} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {3}.) Channel — {2}{U}, Discard Mirrorshell Crab: Counter target spell or ability unless its controller pays {3}.

Counter target noncreature spell.

Counter target spell. Foretell {1}{U} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

{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.

Return all creatures to their owners' hands except for Krakens, Leviathans, Octopuses, and Serpents.

Create a 0/3 blue Crab creature token. Investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")

Whenever you draw a card, you may pay {1}. If you do, put a +1/+1 counter on Nadir Kraken and create a 1/1 blue Tentacle creature token.

{U}: Untap Horseshoe Crab.

Flying

(After you foretell a card, you can place the exiled card here. You may cast it on a later turn for its foretell cost.)

Trample