Kenessos, Priest of Thassa uses extensive library manipulation through scrying effects to stack massive Kraken, Leviathan, Octopus, and Serpent creatures on top of the deck, then cheats them directly onto the battlefield using his activated ability, which is further discounted by cost-reduction artifacts. The deck uses bounce spells and counterspells to protect its threats and clear blockers, while Whelming Wave and similar effects create one-sided board wipes that only leave the sea monsters standing. With evasion-granting effects making the giant creatures unblockable and Spawning Kraken generating additional tokens whenever they connect, the deck wins through overwhelming combat damage from an army of enormous sea creatures.

Kenessos, Priest of Thassa decklist

• Aesi, Tyrant of Gyre Strait
• An Offer You Can't Refuse
• Arcane Denial
• Bala Ged Recovery
• Biomancer's Familiar
• Boseiju, Who Endures
• Brainstorm
• Brainsurge
• Breeding Pool
• Command Tower
• Counterspell
• Cream of the Crop
• Cryptic Command
• Crystal Grotto
• Curse of the Swine
• Dizzy Spell
• Entish Restoration
• Farseek
• Flooded Strand
• 3× Forest
• Glacier Godmaw
• Glasspool Mimic
• Grappling Kraken
• Halimar Depths
• Hedge Maze
• Hullbreaker Horror
• In Search of Greatness
• 5× Island
• Joint Exploration
• Koma, Cosmos Serpent
• Koma, World-Eater
• Long River's Pull
• Mirri's Guile
• Mists of Lórien
• Misty Rainforest
• Moritte of the Frost
• Mystic Confluence
• Mystic Sanctuary
• Nature's Lore
• Nissa, Steward of Elements
• Noxious Revival
• Nykthos, Shrine to Nyx
• Omni-Changeling
• Open the Way
• Otawara, Soaring City
• Planar Genesis
• Planetarium of Wan Shi Tong
• Polluted Delta
• Princess Yue
• Return of the Wildspeaker
• Rivendell
• Rumble Arena
• Sakura-Tribe Elder
• Scalding Tarn
• Scourge of Fleets
• Scroll Rack
• Selvala, Heart of the Wilds
• Sensei's Divining Top
• Serpent of Yawning Depths
• Shadow of the Second Sun
• Shield Broker
• Simic Growth Chamber
• Simic Sky Swallower
• Sin, Unending Cataclysm
• Sink into Stupor
• Sodden Verdure
• Sowing Mycospawn
• Spawning Kraken
• Starwinder
• Summon: Leviathan
• Sylvan Tutor
• Temple of Mystery
• Thassa, God of the Sea
• The Grey Havens
• The Unagi of Kyoshi Island
• Three Steps Ahead
• Three Visits
• Training Grounds
• Turbulent Wilderness
• Urza's Cave
• Verdant Catacombs
• Verdant Kraken
• Wash Away
• Whelming Wave
• Wilderness Reclamation
• Windswept Heath
• Wooded Foothills
• Yavimaya, Cradle of Growth
• Zhalfirin Void
• Inkwell Leviathan
• Thrasios, Triton Hero
• Mystic Speculation
• Mosswort Bridge