Merfolk
A Modern deck, by toby natale
1st place at a tournament in Glassboro, New Jersey, United States on 2016-06-05
As reported at www.starcitygames.com

Maindeck:
12 Island

Artifacts
4 Aether Vial

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

Enchantments
1 Sea's Claim
4 Spreading Seas

Instants
3 Vapor Snag

Legendary Creatures
1 Kira, Great Glass-Spinner

Lands
1 Cavern of Souls
4 Mutavault

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

Sideboard:
2 Relic of Progenitus
1 Merfolk Assassin (Not currently legal in Modern)
1 Dispel
1 Echoing Truth
2 Gut Shot
1 Hibernation
3 Hurkyl's Recall
2 Negate
1 Kira, Great Glass-Spinner
1 Ghost Quarter