Merfolk 
Main deck (60)
Creatures (30)
Instants (5)
Enchantments (4)
Lands (21)
Sideboard (15)
Main deck (60)
Creatures (30)
- 1 Cold-Eyed Selkie
- 4 Harbinger of the Tides
- 4 Lord of Atlantis
- 4 Master of the Pearl Trident
- 4 Merrow Reejerey
- 4 Noble Hierarch
- 3 Phantasmal Image
- 4 Silvergill Adept
- 2 Vendilion Clique
Instants (5)
Enchantments (4)
Lands (21)
Sideboard (15)
Compared with the average Merfolk list
Average of 40 decks in the 90 days up to May 6, 2017, the day of this tournament.
Main deck
More than usual
- +4 Flooded Strand (4 vs 0.1)
- +4 Noble Hierarch (4 vs 0.1)
- +3 Breeding Pool (3 vs 0.1)
- +3 Collected Company (3 vs 0.1)
- +3 Phantasmal Image (3 vs 0.2)
- +2 Polluted Delta (2 vs 0.1)
- +2 Hallowed Fountain (2 vs 0.1)
- +1 Wanderwine Hub (2 vs 0.6)
Fewer than usual
- -8 Island (4 vs 12.0)
- -4 Aether Vial (0 vs 3.9)
- -4 Cursecatcher (0 vs 3.9)
- -4 Master of Waves (0 vs 3.8)
- -1 Cavern of Souls (0 vs 1.1)
- -1 Dismember (0 vs 1.1)
- -1 Kira, Great Glass-Spinner (0 vs 1.0)
Sideboard
More than usual
- +2 Ceremonious Rejection (3 vs 0.5)
- +2 Kor Firewalker (2 vs 0.1)
- +2 Rhox War Monk (2 vs 0.1)
- +2 Rest in Peace (2 vs 0.2)
- +2 Stony Silence (2 vs 0.2)
Fewer than usual
- -3 Unified Will (0 vs 2.8)
- -2 Tidebinder Mage (0 vs 1.7)
- -1 Dispel (0 vs 1.4)
- -1 Tectonic Edge (0 vs 1.2)
- -1 Hurkyl's Recall (0 vs 1.1)
This is the most unusual list of the archetype in this period: 23 cards away from the average.