U/G Merfolk
A Modern deck, by Alan Cummings
8th place at a tournament in Charlotte, North Carolina, United States on 2017-10-14

Maindeck:
4 Island

Artifacts
4 Aether Vial
1 Smuggler's Copter

Creatures
4 Cursecatcher
3 Harbinger of the Tides
4 Kumena's Speaker
4 Lord of Atlantis (Not currently legal in Modern)
4 Master of the Pearl Trident
4 Merfolk Branchwalker
2 Merrow Reejerey
4 Silvergill Adept

Enchantments
4 Spreading Seas

Instants
2 Spell Pierce

Legendary Creatures
1 Kopala, Warden of Waves

Lands
4 Botanical Sanctum
2 Breeding Pool
3 Flooded Strand
3 Mutavault
3 Polluted Delta

Sideboard:
3 Relic of Progenitus
3 Ceremonious Rejection
2 Dismember
3 Dispel
3 Natural State
1 Negate