Merfolk
A Modern deck, by Matt Gibbons
3rd place at a tournament in Littleton, Colorado, United States on 2016-04-24
As reported at www.starcitygames.com

Maindeck:

Artifacts
4 Aether Vial

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
2 Phantasmal Image
4 Silvergill Adept

Enchantments
4 Spreading Seas

Instants
1 Echoing Truth
3 Vapor Snag

Basic Lands
8 Island

Lands
2 Cavern of Souls
4 Mutavault
3 Wanderwine Hub

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

Sideboard:
2 Relic of Progenitus
3 Tidebinder Mage
1 Dismember
2 Dispel
1 Echoing Truth
3 Hurkyl's Recall
2 Negate
1 Kira, Great Glass-Spinner