Merfolk
A Modern deck, by Ty Elrod
6th place at a tournament in Dallas-Fort Worth, Texas, United States on 2015-05-17

Maindeck:
13 Island

Artifacts
4 Aether Vial

Creatures
4 Cursecatcher
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
4 Tidebinder Mage

Enchantments
4 Spreading Seas

Instants
4 Vapor Snag

Legendary Creatures
2 Kira, Great Glass-Spinner

Lands
2 Cavern of Souls
4 Mutavault

Sideboard:
4 Spellskite
3 Dismember
4 Hurkyl's Recall
4 Spell Pierce