Merfolk 
Main deck (60)
Creatures (30)
Instants (2)
Artifacts (8)
Lands (20)
Sideboard (15)
Main deck (60)
Creatures (30)
- 4 Harbinger of the Tides
- 4 Lord of Atlantis
- 4 Master of the Pearl Trident
- 4 Merfolk Trickster
- 4 Silvergill Adept
- 2 Subtlety
- 4 Svyelun of Sea and Sky
- 4 Tide Shaper
Instants (2)
Artifacts (8)
Lands (20)
- 2 Cavern of Souls
- 12 Island
- 4 Mutavault
- 2 Waterlogged Grove
Sideboard (15)
Compared with the average Merfolk list
Average of 11 decks in the 7 days up to Nov. 28, 2021, the day of this tournament.
Main deck
More than usual
- +3 Chalice of the Void (4 vs 0.7)
- +2 Mutavault (4 vs 1.9)
- +2 Harbinger of the Tides (4 vs 2.4)
- +1 Cavern of Souls (2 vs 0.9)
Fewer than usual
- -2 Glasspool Mimic (0 vs 2.3)
- -1 Archmage's Charm (0 vs 1.4)
Sideboard
More than usual
- +4 Suspend (4 vs 0.4)
- +2 Counterspell (4 vs 1.6)
- +2 Echoing Truth (2 vs 0.3)
- +2 Spreading Seas (2 vs 0.4)
Fewer than usual
- -2 Thieving Skydiver (0 vs 1.9)
- -1 Force of Negation (0 vs 1.0)
Most unusual list in this period: aceoum in Modern Challenge (19 cards away from the average)