Merfolk 
Main deck (60)
Creatures (22)
Instants (2)
Artifacts (8)
Enchantments (8)
Lands (20)
Sideboard (15)
Main deck (60)
Creatures (22)
- 2 Harbinger of the Tides
- 4 Lord of Atlantis
- 4 Master of the Pearl Trident
- 4 Master of Waves
- 4 Merrow Reejerey
- 4 Silvergill Adept
Instants (2)
Artifacts (8)
Enchantments (8)
Lands (20)
- 10 Island
- 2 Mutavault
- 3 Polluted Delta
- 4 Scalding Tarn
- 1 Steam Vents
Sideboard (15)
Compared with the average Merfolk list
Average of 5 decks in the 30 days up to Aug. 11, 2017, the day of this tournament.
Main deck
More than usual
- +3 Blood Moon (4 vs 0.8)
- +3 Chalice of the Void (4 vs 0.8)
- +3 Scalding Tarn (4 vs 0.8)
- +2 Polluted Delta (3 vs 0.6)
- +1 Dismember (2 vs 0.8)
Fewer than usual
- -3 Cursecatcher (0 vs 3.2)
- -2 Island (10 vs 12.4)
- -2 Harbinger of the Tides (2 vs 3.6)
- -2 Mutavault (2 vs 3.6)
- -2 Vapor Snag (0 vs 1.6)
Sideboard
More than usual
- +1 Grafdigger's Cage (2 vs 0.6)
- +1 Unified Will (4 vs 2.6)
- +1 Echoing Truth (2 vs 0.8)
- +1 Dismember (2 vs 1.0)
Fewer than usual
- -3 Relic of Progenitus (0 vs 2.8)
- -1 Negate (0 vs 1.2)
This is the most unusual list of the archetype in this period: 12 cards away from the average.