Counter target spell unless its controller pays {X}. If they do, create an X/X blue and black Fish creature token.

Target creature gains flying until end of turn. Draw a card.

Look at the top two cards of your library. Put one of them into your hand and cache the other face down.

Enchant creature
Once each turn, when enchanted creature becomes tapped, you may untap it or put a stun counter on it.

Draw a card. When you do, pay for and choose any number.
+{U} — Return target spell you don't control to its owner's hand. That player draws a card.
+{R} — Target player discards all the cards in their hand, then draws that many cards.
+{G} — Target player may put a land card from their hand or graveyard onto the battlefield.

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

[+2]: Each player puts their hand on the bottom of their library in a random order. You draw five cards, then each opponent draws two cards.
[+1]: Untap each land you control.
[–3]: Return up to three target nonland permanents to their owner's hands.
[–9]: You get an emblem with “Whenever an opponent casts their first spell each turn, gain control of it. You may choose new targets for that spell.”

Whenever you cast a noncreature spell, create a 1/1 white Human creature token, then target player mills two cards.

Whenever you cycle a card, draw a card.
Cycling {2}{U}
When you cycle this card, copy target triggered ability you control. You may choose new targets for the copy.

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

Tap all permanents.
Exile The World Stood Still.

Draw a card if a creature you control has flying. Do the same for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.

Draw three cards. Then discard two cards unless you discard a card with flashback.
Flashback {6}{U}{U}

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.

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.

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

Counter target spell with mana value less than or equal to the number of cards in its controller's graveyard.

When this enchantment enters, cache any number of cards from your hand face down.
Whenever you cast a cached spell, copy it. You may choose new targets for the copy.

Whenever a creature an opponent controls becomes tapped, if it isn't being declared as an attacker, you may draw a card.
{4}{U}: Tap target creature without flying.

Approval — Counter target noncreature spell unless its controller pays {X}, where X is the number of colors among permanents you control.

Enchant creature
Enchanted creature gets +1/+0 and can't be blocked.
{5}{U}, Exile Voyage to the Siren Sea from your graveyard or the battlefield: Draw three cards. This ability costs {1} less for each creature you control that dealt combat damage to an opponent this turn.

Whenever this Subroutine runs, draw two cards. Creatures your opponents control get -2/-0 until your next turn.

Target artifact or creature you control becomes an artifact creature with base power and toughness 5/5 until end of turn.

Target creature can't be blocked this turn. If this spell's flashback cost was paid, put a +1/+1 counter on that creature.
Flashback {1}{U}

You may cast this spell as though it had flash if you activated a nonmana ability this turn.
Target artifact or creature's owner puts it on their choice of the top or bottom of their library.