Merfolk
A Modern deck, by Sherwin Lakhmani
5th place at a tournament in Fort Worth, Texas, United States on 2017-08-12
As reported at www.starcitygames.com

Maindeck:

Artifacts
4 Aether Vial
2 Smuggler's Copter

Creatures
4 Cursecatcher
4 Harbinger of the Tides
4 Lord of Atlantis (Not currently legal in Modern)
4 Master of the Pearl Trident
2 Master of Waves
3 Merrow Reejerey
4 Silvergill Adept

Enchantments
4 Spreading Seas

Instants
1 Dismember
1 Echoing Truth

Legendary Creatures
1 Kira, Great Glass-Spinner
2 Vendilion Clique

Basic Lands
12 Island

Lands
2 Cavern of Souls
4 Mutavault

Legendary Lands
1 Minamo, School at Water's Edge
1 Oboro, Palace in the Clouds

Sideboard:
3 Relic of Progenitus
2 Tidebinder Mage
1 Dismember
2 Dispel
2 Negate
2 Unified Will
2 Tectonic Edge