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Merfolk
A Standard deck, by William Lowry
12th place at a tournament in Dallas, Texas, United States on 2018-01-20

Maindeck:

Artifact Creatures
4 Metallic Mimic (Not currently legal in Standard)

Creatures
4 Deeproot Elite
4 Jungleborn Pioneer
4 Kumena's Speaker
4 Merfolk Mistbinder
4 Mist-Cloaked Herald
2 Seafloor Oracle
4 Silvergill Adept

Instants
1 Essence Scatter
4 Unsummon

Legendary Creatures
4 Kumena, Tyrant of Orazca

Basic Lands
4 Forest
7 Island

Lands
4 Botanical Sanctum (Not currently legal in Standard)
3 Hashep Oasis (Not currently legal in Standard)
4 Unclaimed Territory

Sideboard:
3 Deathgorge Scavenger
2 Tempest Caller
2 Admiral's Order
2 Essence Scatter
2 Naturalize
4 Negate