Triton Shorethief

Starlit Mantle

Flash (You may cast this spell any time you could cast an instant.)
Enchant creature you control
When this Aura enters, enchanted creature gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)
Enchanted creature gets +1/+1.

Font of Fortunes

{1}{U}, Sacrifice this enchantment: Draw two cards.

Witness of Tomorrows

Brine Giant

Affinity for enchantments (This spell costs {1} less to cast for each enchantment you control.)

Chorus of the Tides

Flying
Heroic — Whenever you cast a spell that targets this creature, scry 1. (To scry 1, look at the top card of your library, then you may put that card on the bottom.)

Triton Waverider

Constellation — Whenever an enchantment you control enters, this creature gains flying until end of turn.

Mnemonic Wall

Defender
When this creature enters, you may return target instant or sorcery card from your graveyard to your hand.

Island

Omenspeaker

When this creature 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.)

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.)

Griptide

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

Nyxborn Seaguard

Ichthyomorphosis

Enchant creature
Enchanted creature loses all abilities and is a blue Fish with base power and toughness 0/1.

War-Wing Siren

Flying
Heroic — Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature.

Lost in a Labyrinth

Target creature gets -3/-0 until end of turn. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Thassa's Devourer

Constellation — Whenever this creature or another enchantment you control enters, target player mills two cards.

Sudden Storm

Tap up to two target creatures. Those creatures don't untap during their controllers' next untap steps. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Breaching Hippocamp

Flash (You may cast this spell any time you could cast an instant.)
When this creature enters, untap another target creature you control.

Floodtide Serpent

This creature can't attack unless you return an enchantment you control to its owner's hand. (This cost is paid as attackers are declared.)

Omen of the Sea

Flash (You may cast this spell any time you could cast an instant.)
When this enchantment enters, scry 2, then draw a card.
{2}{U}, Sacrifice this enchantment: 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.)

Towering-Wave Mystic

Whenever this creature deals damage, target player mills that many cards.

Wavecrash Triton

Heroic — Whenever you cast a spell that targets this creature, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.

Godhunter Octopus

This creature can't attack unless defending player controls an enchantment or an enchanted permanent.

Vexing Gull

Rise of Eagles

Create two 2/2 blue Bird enchantment creature tokens with flying. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Evanescent Intellect

Enchant creature
Enchanted creature has "{1}{U}, {T}: Target player mills three cards."

Sigiled Starfish

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

Hubris

Return target creature and all Auras attached to it to their owners' hands.

Crackling Triton

{2}{R}, Sacrifice this creature: It deals 2 damage to any target.

Crypsis

Target creature you control gains protection from creatures your opponents control until end of turn. Untap it.

Coastline Chimera

Flying
{1}{W}: This creature can block an additional creature this turn.

Chain to Memory

Target creature gets -4/-0 until end of turn. Scry 2.

Thirst for Meaning

Draw three cards. Then discard two cards unless you discard an enchantment card.

Nullify

Aqueous Form

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.)

Pin to the Earth

Enchant creature
Enchanted creature gets -6/-0.

Annul

Counter target artifact or enchantment spell.

Voyage's End

Return target creature to its owner's hand. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Stratus Walk

Enchant creature
When this Aura enters, draw a card.
Enchanted creature has flying. (It can't be blocked except by creatures with flying or reach.)
Enchanted creature can block only creatures with flying.

Deny the Divine

Counter target creature or enchantment spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Triton Shorestalker

Nimbus Naiad

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.

Stern Dismissal

Return target creature or enchantment an opponent controls to its owner's hand.

Eidolon of Philosophy

{6}{U}, Sacrifice this creature: Draw three cards.

Deepwater Hypnotist

Inspired — Whenever this creature becomes untapped, target creature an opponent controls gets -3/-0 until end of turn.

Fate Foretold

Enchant creature
When this Aura enters, draw a card.
When enchanted creature dies, its controller draws a card.

Cloaked Siren

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

Sphinx's Disciple

Flying
Inspired — Whenever this creature becomes untapped, draw a card.

Divination

Retraction Helix

Until end of turn, target creature gains "{T}: Return target nonland permanent to its owner's hand."

Riptide Turtle

Countermand

Counter target spell. Its controller mills four cards.

Stymied Hopes

Counter target spell unless its controller pays {1}. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Thassa's Bounty

Draw three cards. Target player mills three cards.

Benthic Giant

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Memory Drain

Sleep of the Dead

Tap target creature. It doesn't untap during its controller's next untap step.
Escape—{2}{U}, Exile three other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)

Naiad of Hidden Coves

During turns other than yours, spells you cast cost {1} less to cast.

Nyxborn Triton

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.)
Enchanted creature gets +2/+3.

Elite Instructor

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

Vaporkin

Flying
This creature can block only creatures with flying.

Aerial Formation

Strive — This spell costs {2}{U} more to cast for each target beyond the first.
Any number of target creatures each get +1/+1 and gain flying until end of turn.