This is a two color tribal aggro deck that looks to flood the board with Merfolk and then power them up with cards like Master of the Pearl Trident and Merfolk Mistbinder.

Creatures (40)
4
Glasspool Mimic
4
Kumena's Speaker
2
Merfolk Windrobber
4
Mistcaller
4
Shoreline Scout
2
Deeproot Elite
4
Master of the Pearl Trident
4
Merfolk Mistbinder
4
Silvergill Adept
4
Merrow Reejerey
4
Svyelun of Sea and Sky
Spells (4)
4
Collected Company
Lands (16)
4
Barkchannel Pathway
4
Botanical Sanctum
4
Breeding Pool
4
Island
Cards (60)
Sideboard (15)
4
Miscast
2
Primal Might
2
Aether Gust
3
Brazen Borrower
2
Kopala, Warden of Waves
2
Reclamation Sage