Flash When Guppyfin Duelist enters the battlefield, create a green Aura enchantment token named Piranha's Prowess attached to target creature. The token has enchant creature and “Enchanted creature gets +2/+2.” Untap that creature.
When Harried Submersible enters the battlefield, target opponent creates a 1/1 blue Tentacle creature token. Whenever Harried Submersible deals combat damage to a player or planeswalker, draw a card. Crew 2
When Hila Okunos enters the battlefield, look at the top six cards of your library. You may reveal an Aura or Aurashaper card from among them and put it into your hand. Put the rest on the bottom of your library in a random order. Whenever another nontoken Aura or Aurashaper enters the battlefield under your control, create a token that's a copy of it.
When Idyllic Odyssey enters the battlefield, create a 1/1 white Merfolk creature token. Concord — At the beginning of combat on your turn, if there are four or more card types among permanents you control, put a +1/+1 counter on target creature you control. That creature gains lifelink until end of turn.
Trust in the Great Current, and it will lead you far.
Concord — You may cast this spell as though it had flash if there are four or more card types among permanents you control. When Krill-Clan Guardian enters the battlefield, it fights up to one other target creature. If that creature would die this turn, return it to its owner's hand instead.
“I fight in the memory of my graceful ancestor, who left this sea for another above.”