1 Arcane Signet
1 Beast Within
1 Benthic Biomancer
1 Breaking Wave
1 Brineborn Cutthroat
1 Cold-Eyed Selkie
1 Counterspell
1 Cryptic Gateway
1 Cryptolith Rite
1 Deeproot Champion
1 Deeproot Elite
1 Distant Melody
1 Forerunner of the Heralds
1 Growth Spiral
1 Harvest Season
1 Herald of Secret Streams
1 Herald's Horn
1 Heroic Intervention
1 Incubation // Incongruity
1 Inspiring Call
1 Intruder Alarm
1 Jadelight Ranger
1 Jiang Yanggu, Wildcrafter
1 Kindred Discovery
1 Kindred Summons
1 Kiora's Follower
1 Kopala, Warden of Waves
1 Kumena, Tyrant of Orazca
1 Leech Bonder
1 Lord of Atlantis
1 Merfolk Mistbinder
1 Merfolk Skyscout
1 Merfolk Trickster
1 Merrow Commerce
1 Mistcaller
1 Murkfiend Liege
1 Nature's Claim
1 Negate
1 Opposition
1 Plasm Capture
1 Prime Speaker Zegana
1 Quandrix Command
1 Quest for Renewal
1 Reflections of Littjara
1 Return to Nature
1 Rising Waters
1 River's Rebuke
1 Saprazzan Heir
1 Sea Scryer
1 Seahunter
1 Seedborn Muse
1 Simic Signet
1 Sol Ring
1 Song of Freyalise
1 Stonybrook Banneret
1 Surgespanner
1 Svyelun of Sea and Sky
1 Swan Song
1 Swift Warden
1 Thada Adel, Acquisitor
1 Thieving Skydiver
1 Tide Shaper
1 True-Name Nemesis
1 Vitalize
1 Voidslime
1 Wake Thrasher
1 Wanderwine Prophets
Sideboard:
1 Adrix and Nev, Twincasters
1 Alchemist's Refuge
1 Ambassador Laquatus
1 Aquatic Incursion
1 Aquitect's Will
1 Awakening
1 Barkchannel Pathway // Tidechannel Pathway
1 Botanical Sanctum
1 Breeding Pool
1 Cephalid Coliseum
1 Chain Stasis
1 Command Tower
1 Coralhelm Commander
1 Cosi's Trickster
1 Court of Garenbrig
1 Cryptic Command
1 Cursecatcher
1 Darting Merfolk
1 Deepchannel Mentor
1 Deeproot Waters
1 Deeproot Wayfinder
1 Dramatic Reversal
1 Drowner of Secrets
1 Emperor Mihail II
1 Empress Galina
1 Enclave Cryptologist
1 Faces of the Past
1 Fallowsage
1 Fathom Trawl
1 Filter Out
1 Flooded Grove
1 For the Ancestors
1 Forest
1 Grimoire Thief
1 Hadana's Climb // Winged Temple of Orazca
1 Harbinger of the Tides
1 Hinterland Harbor
1 Inundate
1 Island
1 Isochron Scepter
1 Karn's Bastion
1 Krosan Grip
1 Leyline of Anticipation
1 Lullmage Mentor
1 Master of the Pearl Trident
1 Master of Waves
1 Merfolk Skydiver
1 Merfolk Sovereign
1 Merrow Harbinger
1 Merrow Reejerey
1 Metallic Mimic
1 Minamo, School at Water's Edge
1 Misty Rainforest
1 Mobilize
1 Mutavault
1 Nature's Lore
1 Neoform
1 Novijen, Heart of Progress
1 Ozolith, the Shattered Spire
1 Path of Ancestry
1 Path of Discovery
1 Pongify
1 Reef Shaman
1 Rejuvenating Springs
1 Reliquary Tower
1 Retraction Helix
1 Rishadan Dockhand
1 Rootwater Thief
1 Sage of Fables
1 Seafloor Oracle
1 Selkie Hedge-Mage
1 Shapers of Nature
1 Shapers' Sanctuary
1 Sigil Tracer
1 Silvergill Adept
1 Streambed Aquitects
1 Submerge
1 Talisman of Curiosity
1 Temple of Mystery
1 Thassa's Rebuff
1 The Great Henge
1 Thrasios, Triton Hero
1 Tishana, Voice of Thunder
1 Unclaimed Territory
1 Unity of Purpose
1 Vineglimmer Snarl
1 Vodalian Hexcatcher
1 Waterlogged Grove
1 Yavimaya Coast
1 Zegana, Utopian Speaker