Oko Merfolk
A Modern deck, by Jason Reid
4th place at a tournament in Saginaw, Michigan, United States on 2019-10-26
As reported at http://www.starcitygames.com

Maindeck:

Artifacts
4 Aether Vial

Creatures
2 Brazen Borrower
4 Kumena's Speaker
4 Lord of Atlantis (Not currently legal in Modern)
4 Master of the Pearl Trident
4 Merfolk Mistbinder
4 Merfolk Trickster
4 Silvergill Adept

Enchantments
4 Spreading Seas

Instants
3 Force of Negation

Legendary Planeswalkers
3 Oko, Thief of Crowns (Banned in Modern)

Basic Lands
4 Island

Lands
4 Botanical Sanctum
2 Breeding Pool
1 Cavern of Souls
2 Flooded Strand
3 Mutavault
4 Waterlogged Grove

Sideboard:
3 Chalice of the Void
3 Grafdigger's Cage
2 Relic of Progenitus
4 Collector Ouphe
2 Deprive
1 Force of Negation