Standard Fish-people Deck
With the usual plan of dumping out as many merfolk as quickly as possible to turn sideways and hopefully win.
Jade Bearer and Kumena's Speaker fill our 1 drop slot, while Jade Bearer is sub-optimal on turn 1, because the deck leans more heavily on green than blue, the risk of not being able to play Mist-Cloaked Herald turn 1 is worse.
Merfolk Mistbender and Deeproot Elite are the most efficient lords available, while Metallic Mimic is good, the fact that Deeproot Elite allows us to put the counters on any merfolk is huge.
Herald of Secret Streams with Deeproot Elite and the explore on Merfolk Branchwalker and Jadelight Ranger means we can often swing in regardless of blockers. Tempest Caller is also noteworthy as possibly filling this slot, as it's less reliant as on the 1/1 counters and opens the opponent up to a full alpha-strike, but the double blue for the cost is worrisome.
Kumena, Tyrant of Orazca is our top end and combined with Silvergill Adept and our Explore creatures offers a good amount of card draw/scrying to dig out the cards we need.
Blossoming Defense allows us to power up for offence and prevent targeted removal with Swift Warden acting as #4 and #5 while also providing a 3/3 body for 1G, Kopala, Warden of Waves also helps on defense and usually eats a removal spell for an additional 2 mana (which makes Fatal Push average at best)
Unsummon provides defence against Red Aggro's (RIP Ramunap Ruins) Hazoret the Fervent and Glorybringer, and against The Scarab God. Main-board Scavenger Grounds provides some defense against God-Pharaoh's Gift decks and The Scarab God's ability, while Ipnu Rivulet provides an out against Approach of the Second Sun.
Side-board we have more control if we need it through Negate, Spell Pierce, and another Kopala, Warden of Waves. Another Deeproot Waters to bring in for the grindy matches. Heroic Intervention to save our board in the face of a Fumigate or other boardwipe. Crook of Condemnation to offer more tools against GPG or other decks with a graveyard focus. Naturalize and Natural Obsolescence give some artifact/enchantment hate, though the number may be to high.
Currently the deck needs 1 card cut, but what to cut I'm still not sure of at this time, suggestions and feedback are appreciated!
