Thirst for Meaning

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

Island

Brine Giant

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

Naiad of Hidden Coves

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

Nyxborn Seaguard

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.

Thaumaturge's Familiar

Flying
When this creature enters, scry 1.

Ichthyomorphosis

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

Stern Dismissal

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

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.)

Witness of Tomorrows

Riptide Turtle

Triton Waverider

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