Merfolk
A Modern deck, by Joshua Serano
8th place at a tournament in Roanoke, Virginia, United States on 2013-03-03
As reported at www.starcitygames.com

Maindeck:

Artifacts
4 Aether Vial
1 Sword of War and Peace

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
4 Spreading Seas

Instants
3 Spell Pierce
4 Vapor Snag

Legendary Creatures
1 Sygg, River Cutthroat

Sorceries
3 Gitaxian Probe (Banned in Modern)

Basic Lands
4 Island

Lands
3 Hallowed Fountain
4 Misty Rainforest
4 Mutavault
4 Wanderwine Hub

Sideboard:
1 Grafdigger's Cage
2 Pithing Needle
1 Relic of Progenitus
2 Spellskite
1 Rootborn Defenses
3 Surgical Extraction
3 Geist of Saint Traft
2 Timely Reinforcements