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

Flying
{3}{U}: Scry 1.

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Flash
Flying

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Constellation — Whenever an enchantment enters the battlefield under your control, Triton Waverider gains flying until end of turn.

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Whenever Towering-Wave Mystic deals damage, target player puts that many cards from the top of their library into their graveyard.

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Flash
Enchant creature you control
When Starlit Mantle enters the battlefield, enchanted creature gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)
Enchanted…

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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.)

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Flash
When Omen of the Sea enters the battlefield, scry 2, then draw a card.
{2}{U}, Sacrifice Omen of the Sea: Scry 2.

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When Elite Instructor enters the battlefield, draw a card, then discard a card.

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{6}{U}, Sacrifice Eidolon of Philosophy: Draw three cards.

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

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

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Counter target spell. Scry 2.

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