Merfolk
A Modern deck, by Brandon Gross
4th place at a tournament in Portland, Oregon, United States on 2015-05-03

Maindeck:
14 Island

Artifacts
4 Aether Vial
1 Vedalken Shackles

Creatures
4 Cursecatcher
4 Lord of Atlantis (Not currently legal in Modern)
4 Master of the Pearl Trident
4 Merrow Reejerey
2 Phantasmal Image
4 Silvergill Adept

Enchantments
2 Monastery Siege
4 Spreading Seas

Instants
3 Spell Pierce
4 Vapor Snag

Lands
2 Cavern of Souls
4 Mutavault

Sideboard:
2 Chalice of the Void
2 Master of Waves
4 Tidebinder Mage
1 Dismember
3 Hurkyl's Recall
1 Spell Pierce
2 Swan Song