Merfolk
A Standard deck, by Jim Forgus
9th 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 (Not currently legal in Standard)
4 Jungleborn Pioneer (Not currently legal in Standard)
4 Kumena's Speaker (Not currently legal in Standard)
4 Merfolk Mistbinder (Not currently legal in Standard)
4 Mist-Cloaked Herald (Not currently legal in Standard)
2 Seafloor Oracle (Not currently legal in Standard)
4 Silvergill Adept (Not currently legal in Standard)

Instants
2 Essence Scatter (Not currently legal in Standard)
2 Unsummon (Not currently legal in Standard)

Legendary Creatures
4 Kumena, Tyrant of Orazca (Not currently legal in Standard)

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 (Not currently legal in Standard)

Sideboard:
2 Deathgorge Scavenger (Not currently legal in Standard)
2 Tempest Caller (Not currently legal in Standard)
2 Admiral's Order (Not currently legal in Standard)
1 Essence Scatter (Not currently legal in Standard)
1 Life Goes On (Not currently legal in Standard)
3 Naturalize (Not currently legal in Standard)
4 Negate