Draw three cards.
Surface {5}{U}{U}

Once each turn, when you activate a nonmana ability, you may put a +1/+1 counter on Feeble Fish. Then if there are three or more +1/+1 counters on it, remove them all and transform it.

Ward {2}
Spells and abilities you control that target Fabulous Serpent cost {2} less.
{2}{U}: Creatures you control get +1/+1 until end of turn.

Vigilance
{T}: Surveil 1.
Surface {3}{U}

Whenever Floe Master enters or another creature you control surfaces, tap up to one target creature and put a stun counter on it.
Surface {5}{U}{U}

{T}: Add {C}. You may sacrifice Fortune Bearer. If you don't, you can't spend this mana to cast a spell from your hand.
Surface {5}{U}{U}. Fortune Bearer surfaces transformed.

Whenever Devourer of Fortunes enters or attacks, return up to one target instant or sorcery card in a graveyard or creature on the battlefield to its owner's hand. You may cast a copy of it, and may spend mana of any type to cast it.

Surveil 1, then draw a card. Exile Harbor Mail with a stamp counter on it.
When you cast a spell that has surface, if Harbor Mail is exiled with a stamp counter, you may put it into your graveyard. If you do, surveil 1, then draw a card.

Flying
When Herald of Drizzles enters, it acclimates.

Amity — This spell costs {1} less to cast if you attacked with exactly two creatures this turn.
Draw two cards.

When Kappa Colony enters, create three 1/1 green Plant creature tokens.
Whenever you cast a spell from your graveyard, put a +1/+1 counter on each Plant you control.

King of Currents can't attack unless there are six or more cards in your graveyard.
Surface {4}{U}{U}

{2}: Target creature gets +0/+3 until end of turn. Activate only as a sorcery and only once each turn.

Flying
Amity — Whenever you attack with Nimbus Dragon and exactly one other creature, tap target creature defending player controls.

Target creature you control gains hexproof until end of turn. When a nonmana ability of that creature is next activated or triggered this turn, copy it. You may choose new targets for the copy.

Amity — When you cast this spell, copy it if you attacked with exactly two creatures this turn. You may choose new targets for the copy.
Target creature gets +0/+2 and gains hexproof until end of turn.

When Primordial Seas enters and whenever you cast a spell, create a token that's a copy of another target permanent you control.

Whenever you attack, create a tapped and attacking token that's a copy of target attacking creature, except it isn't legendary. Sacrifice it at the beginning of the next end step.

Surface {2}{B}{G}{U}. Riverbed Snapper surfaces transformed.

Ward {3}
Daunting Snapper can't be blocked by creatures with power 2 or less.

Surface {U}. Scuttling Cicada surfaces transformed.

Flying

When Sea Breeze enters, return up to one target creature to its owner's hand, then surveil 1.

Look at the top two cards of your library. Put one into your hand and the other into your graveyard.
Surface {2}{U}

Amity — Whenever you attack with Splashing Mudskipper and exactly one other creature, surveil 1. When Splashing Mudskipper deals combat damage to a player this combat, you may transform it.