Merfolk
A Modern deck, by Hunter Nance
4th place at a tournament in Cary, North Carolina, United States on 2017-06-25
As reported at www.starcitygames.com

Maindeck:
11 Island

Artifacts
4 Aether Vial
1 Relic of Progenitus

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

Enchantments
4 Spreading Seas

Instants
3 Vapor Snag

Legendary Creatures
2 Kira, Great Glass-Spinner

Lands
2 Cavern of Souls
4 Mutavault

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

Sideboard:
1 Grafdigger's Cage
1 Relic of Progenitus
3 Tidebinder Mage
1 Threads of Disloyalty
2 Dismember
2 Dispel
1 Echoing Truth
1 Negate
3 Unified Will