Merfolk
A Legacy deck, by Daniel Duffee
1st place at a tournament in Wilbraham, Massachusetts, United States on 2016-12-11
As reported at www.starcitygames.com

Maindeck:

Artifacts
4 Aether Vial
4 Chalice of the Void

Creatures
4 Cursecatcher
2 Harbinger of the Tides
4 Lord of Atlantis
4 Master of the Pearl Trident
3 Phantasmal Image
4 Silvergill Adept
4 True-Name Nemesis

Instants
4 Force of Will

Legendary Artifacts
1 Umezawa's Jitte

Legendary Creatures
1 Vendilion Clique

Basic Lands
12 Island

Lands
4 Cavern of Souls
4 Mutavault
1 Wasteland

Sideboard:
1 Grafdigger's Cage
1 Manriki-Gusari
2 Pithing Needle
1 Relic of Progenitus
1 Gilded Drake
2 Arcane Laboratory
2 Back to Basics
1 Echoing Truth
1 Misdirection
1 Surgical Extraction
1 Umezawa's Jitte
1 Wasteland