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 40 decks in the 90 days up to Aug. 11, 2017, the day of this tournament.
Main deck
More than usual
- +4 Blood Moon (4 vs 0.1)
- +4 Chalice of the Void (4 vs 0.1)
- +4 Scalding Tarn (4 vs 0.1)
- +3 Polluted Delta (3 vs 0.4)
Fewer than usual
- -4 Cursecatcher (0 vs 3.9)
- -2 Mutavault (2 vs 3.9)
- -2 Harbinger of the Tides (2 vs 3.5)
- -1 Island (10 vs 11.5)
- -1 Cavern of Souls (0 vs 1.3)
Sideboard
More than usual
- +2 Dismember (2 vs 0.2)
- +2 Grafdigger's Cage (2 vs 0.3)
- +2 Unified Will (4 vs 2.3)
- +2 Echoing Truth (2 vs 0.4)
- +1 Hurkyl's Recall (2 vs 0.7)
Fewer than usual
- -3 Relic of Progenitus (0 vs 3.0)
- -2 Dispel (0 vs 1.8)
- -1 Gut Shot (0 vs 1.3)
Most unusual list in this period: PTarts2win in Modern Challenge (20 cards away from the average)