The first spell you cast each turn costs {2} less to cast.
The second spell you cast each turn can't be countered.
Whenever you cast your third spell each turn, draw a card.

This spell costs {2} less to cast if your devotion to blue is three or greater.
Scry 2, then draw two cards.

Target opponent reveals cards from the top of their library until four land cards are revealed. Exile each card revealed this way. If seven or fewer cards were exiled this way, scry 3.

Whenever you cast a creature spell, put X depth counters on Tide's Ire, where X is that spell's mana value.
Remove ten depth counters from Tide's Ire: Create an 8/8 blue Kraken creature token.
Remove thirty depth counters from Tide's Ire: Create Tromokratis, a legendary 20/20 blue Kraken creature token with trample and hexproof.

Flash
Whenever Thassa's Tideshaper attacks, defending player mills two cards and you draw a card. Then discard a card unless defending player has eight or more cards in their graveyard.

Target creature gains hexproof until end of turn. Untap it.
Draw a card if your devotion to blue is three or greater.

Flying
Ward {X}, where X is the number of enchantments you control.
Whenever Stormscraper of Ketaphos deals combat damage to a player or planeswalker, create a token that's a copy of another target enchantment you control.

Draw two cards.
Return all nonland, nonenchantment permanents to their owners' hands.
You may cast a non-Saga spell with mana value 5 or less from your hand without paying its mana cost.

Untap up to X permanents you control during each other player's untap step, where X is the number of Shrines you control.

Defender
Shoreline Crasher gets +2/+0 and can attack as though it didn't have defender as long as it is enchanted.

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

Enchant creature
Whenever enchanted creature attacks, put a +1/+1 counter on it. Then if it has three or more +1/+1 counters on it, sacrifice Ordeal of Ephara.
When you sacrifice Ordeal of Ephara, return up to two target nonland permanents to their owner's hand.

Flash
When Omen of Deception enters, counter target spell unless its controller pays {2}.
{2}{U}, Sacrifice Omen of Deception: Scry 2.

Whenever an enchantment you control enters, each opponent mills two cards.

Tap up to two target creatures. Put a stun counter on each of them.

Return target creature or enchantment to its owner's hand. If that permanent's controller has eight or more cards in their graveyard, its owner puts it on the top or bottom of their library instead.

Flying
{5}: Draw a card. Activate only if your devotion to blue is three or greater.

Whenever you draw your second card each turn, scry 1 then put a +1/+1 counter on Melancholic Oracle.

Create two 1/1 blue Wizard creature tokens with prowess.

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.

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

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.

Flying
Haubay's Familiar can block only creatures with flying.
Whenever you draw your second card each turn, put a +1/+1 counter on Haubay's Familiar.

Whenever you cast a noncreature spell, choose one —
• Create a 1/1 white Human creature token.
• Target player mills three cards.
• Scry 2.