At the beginning of your end step, if you cast no spells this turn, surveil 1.
Spellcharge 6

This spell can't be countered.
Flying, ward {2}
Whenever Hoarding Culebre enters or attacks, draw a card. Then if you have five or more cards in hand, create a Treasure token.

Ward {3}
Whenever Horror of the Mystic Sea attacks, defending player mills two cards. If they milled two nonland cards this way, Horror of the Mystic Sea can't be blocked this turn.

Target creature has base power and toughness 1/1 and loses all abilities until your next turn.
Draw a card.

Scry 1. Draw a card, then discard a card.
Flashback {U}

Vigilance
When Informed Voter enters, make a pledge.

When Inside Job enters, target creature can't be blocked this turn.
Whenever you amp it up, return Inside Job to its owner's hand.

Target player mills twice X cards.

When Invader of Privacy enters, surveil 1, then draw a card.

Put a defender counter on each creature.

Counter target spell. That spell's controller reveals their hand.

Flying
Discard a card: Put a +1/+1 counter on Jetstream Cruiser. Activate only once each turn.

Whenever you cast an instant or sorcery spell, surveil 1. Lanternlight Assailant gets +1/+0 and gains flying until end of turn.
As long as there are five or more instant and/or sorcery cards in your graveyard, instant and sorcery spells you cast cost {1} less to cast.

Instant and sorcery spells you cast cost {1} less to cast.
{2}{U}: Level 2
When this Class becomes level 2, you may return target instant or sorcery card from your graveyard to your hand.
{3}{U}: Level 3
Once each turn, when you cast an instant or sorcery spell, you may copy that spell. You may choose new targets for the copies.

Enchant creature
When Left to the Sea enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.

Choose one —
• Draw three cards.
• Return up to two target creatures to their owners' hands.

At the beginning of your end step, scry 1. Then if it's your first turn of the game or you discarded a card named Leystone of Depths this turn, draw a card.
Cycling {U}

Create a 2/2 blue Drake creature token with flying.
Whenever a creature you control enters, if it wandered, you may exile Lofty Frontiers from your graveyard. If you do, create a 2/2 blue Drake creature token with flying.

Put any number of target noncreature cards from your graveyard on top of your library in any order.
Draw a card, then exile Long-Lost Legacy.

Kraken, Leviathan, Octopus, and Serpent spells you cast cost {X} less to cast, where X is your devotion to blue.

Indulgence
When Lost in the Moment enters, draw a card then discard a card.
Whenever you indulge, each opponent mills four cards.

Create X blue Shrine enchantment tokens named Unmarked Shrine with “At the beginning of your upkeep, each opponent mills a card.”
{1}{U}, Exile Lost to Memory from your graveyard: Draw two cards. Activate only if an opponent has eight or more cards in their graveyard.

Flash
Lyceum Project enters with a +1/+1 counter and a flying counter on it.
When Lyceum Project dies, you may put its counters on target creature.

Put a +1/+1 counter on target creature. It gets +0/+2 until end of turn.