Thassa, Deep-Dwelling turns a mono-blue pile of enters-the-battlefield creatures into a value engine. At each of its controller's end steps it flickers one creature, so effects like stealing permanents, bouncing, tutoring, drawing and regrowing spells repeat every turn, and Panharmonicon and Virtue of Knowledge double those triggers. Heavy blue devotion feeds Nykthos and Nyx Lotus for big mana bursts. Clones and creature theft snowball the board, and recurring extra-turn spells with spell-returning Wizards locks the game. How it wins: It loops Time Warp or Temporal Manipulation by flickering or rebuying Archaeomancer-style creatures for infinite turns, or otherwise takes over the board with stolen creatures and big blue threats to beat down a locked-out table. Key roles: - End-step flicker engine: Thassa and other blink or bounce outlets reuse enter-the-battlefield triggers every turn, and the bounce outlets also draw cards when creatures leave without dying. (Deadeye Navigator, Displacer Kitten, Dour Port-Mage) - Trigger doublers and clones: these double the enters-the-battlefield triggers or copy the best value creatures, so each blink does twice the work. (Panharmonicon, Virtue of Knowledge, Spark Double) - Steal and bounce control: repeatable creature theft and mass or targeted bounce take opponents' best permanents and clear blockers. (Agent of Treachery, Sower of Temptation, Scourge of Fleets) - Spell recursion and extra turns: creatures that return instants and sorceries, re-triggered by flicker, rebuy extra-turn spells and counterspells, which forms the infinite-turn lock. (Archaeomancer, Time Warp, Temporal Manipulation) - Devotion mana and untap ramp: piled-up blue pips power huge mana from devotion sources, and land-untapping creatures produce surplus mana when re-triggered. (Nykthos, Shrine to Nyx, Nyx Lotus, Peregrine Drake) - Flash and counter protection: the flash enablers let creatures arrive at instant speed while counterspells shield the engine and the combo turn. (Leyline of Anticipation, Teferi, Mage of Zhalfir, Force of Negation)

Thassa v3 decklist

• 22× Island
• Nyx Lotus
• Arcane Signet
• Mystic Sanctuary
• Swan Song
• Lonely Sandbar
• Archaeomancer
• Caged Sun
• Floodgate
• Mind Stone
• Phyrexian Ingester
• Phyrexian Metamorph
• Reliquary Tower
• Rhystic Study
• Rogue's Passage
• Sakashima the Impostor
• Sea Gate Oracle
• Sol Ring
• Solemn Simulacrum
• Thought Vessel
• Treasure Mage
• Barrin, Tolarian Archmage
• Shipwreck Dowser
• Salvager of Secrets
• Strip Mine
• Agent of Treachery
• Leyline of Anticipation
• Meteor Golem
• Arcane Lighthouse
• Buried Ruin
• Ixidron
• Myriad Landscape
• Mana Drain
• Ray of Command
• Temporal Manipulation
• Time Warp
• Vedalken Shackles
• Pact of Negation
• Venser, Shaper Savant
• Vedalken Aethermage
• Mystic Remora
• Evacuation
• Peregrine Drake
• Spellseeker
• Sower of Temptation
• Duplicant
• Panharmonicon
• Scavenger Grounds
• Cyclonic Rift
• Scourge of Fleets
• Teferi, Mage of Zhalfir
• March of the Machines
• Terrain Generator
• Sapphire Medallion
• Palinchron
• Blast Zone
• Emergence Zone
• Spark Double
• Force of Negation
• Tribute Mage
• Watcher for Tomorrow
• Kefnet's Monument
• Consecrated Sphinx
• Capture of Jingzhou
• Sky Diamond
• Riptide Laboratory
• Muddle the Mixture
• Domineering Will
• Nykthos, Shrine to Nyx
• Chamber of Manipulation
• Treachery
• Glasspool Mimic // Glasspool Shore
• Spectral Deluge
• Liquimetal Torque
• Step Through
• Mind Flayer
• Sludge Monster
• March of Swirling Mist
• An Offer You Can't Refuse
• Shield Broker
• Displacer Kitten
• Aether Channeler
• Demolition Field
• Virtue of Knowledge // Vantress Visions
• Flesh Duplicate
• Kitesail Larcenist
• Scampering Surveyor
• Struggle for Project Purity
• Serum Visionary
• Sink into Stupor // Soporific Springs
• Three Tree City
• Dour Port-Mage
• High Fae Trickster
• Summon: Leviathan
• Summon: Valefor
• Dauntless Scrapbot
• Chameleon, Master of Disguise
• Emeritus of Ideation // Ancestral Recall
• Galactus, Devourer of Worlds
• Deadeye Navigator