This is a four-color control deck with Jace, Multiverse Architect at its center. It walls itself off with attack taxes, counters the threats that matter and sweeps the board, while Jace's +1 sorts through the deck for the right answers. The key engine is cheating fat creatures into play. Jace's −3 exiles a token or a cheap creature and reveals until it finds a creature or planeswalker, and the all-in creature swaps do the same on a larger scale. Since the deck's only creature cards are a handful of huge game-ending bombs, every reveal hits a top-end threat. How it wins: It controls the game behind taxes, counters and wraths until a revealed or hard-cast bomb (Archon of Cruelty, Archfiend of Despair, Avacyn, Absolute Virtue, Serra's Emissary) or a swarm of tokens and Sharks finishes opponents, with Darksteel Angel and Absolute Virtue locking out losses. Key roles: - Attack taxes: These stack with Jace, Multiverse Architect's own per-combat toll to make attacking the player and their planeswalkers prohibitively expensive, buying time for a slow control plan (Propaganda, Ghostly Prison, Sphere of Safety). - Polymorph bomb package: Jace, Multiverse Architect's −3 and the mass-swap spells turn throwaway tokens into the deck's few creatures, all of them huge threats, and the low creature count guarantees big hits (Mass Polymorph, Synthetic Destiny, Proteus Staff). - Token fodder: Cheap token makers supply bodies to exile into polymorph effects, block in a pinch and feed incidental value engines (Lingering Souls, Secure the Wastes, Staff of the Storyteller). - Countermagic and spot removal: A dense suite of counters and efficient exile effects protects Jace and stops opposing combos and bombs (Counterspell, Disallow, Swords to Plowshares). - One-sided wipes: Sweepers that leave behind tokens or an Incubator reset the board while keeping a body for the next swap, and indestructibility tricks shield the deck's own side (Martial Coup, Sunfall, Flawless Maneuver). - Card selection and spell-cast value: Top-deck manipulation stacks the library to set up reveals, while noncreature-spell triggers turn every counter and cantrip into cards or Sharks (Brainstorm, Whirlwind of Thought, Shark Typhoon).

Polymorph decklist

• Brainsurge
• Propaganda
• Rakdos Signet
• Sphere of Safety
• Ghostly Prison
• Sol Ring
• Arcane Signet
• Talisman of Progress
• Fellwar Stone
• Azorius Signet
• Talisman of Dominance
• Chromatic Lantern
• Izzet Signet
• Dimir Signet
• Talisman of Creativity
• Dig Through Time
• Ponder
• Brainstorm
• Whirlwind of Thought
• Fact or Fiction
• Swords to Plowshares
• Stroke of Midnight
• Path to Exile
• Expressive Iteration
• Despark
• Martial Coup
• Sunfall
• Counterspell
• White Sun's Twilight
• Swan Song
• Dovin's Veto
• Negate
• Disallow
• Render Silent
• Spell Pierce
• Saw It Coming
• Dreadhorde Invasion
• Skrelv's Hive
• Secure the Wastes
• Shark Typhoon
• Elspeth, Sun's Champion
• Staff of the Storyteller
• Windcrag Siege
• Lingering Souls
• Currency Converter
• Farewell
• Restless Spire
• Restless Anchorage
• Kher Keep
• Avacyn, Angel of Horror
• Nezahal, Primal Tide
• Serra's Emissary
• Archon of Cruelty
• Archfiend of Despair
• Absolute Virtue
• Nissa, Leyline Tamer
• Darksteel Angel
• Glacial Fortress
• Turbulent Wetlands
• Exotic Orchard
• Sunken Ruins
• Mass Polymorph
• Command Tower
• Mystic Gate
• Proteus Staff
• Turbulent Shore
• Stingerquill Annex
• Fetid Heath
• Synthetic Destiny
• Prairie Stream
• Fatehold Annex
• Path of Ancestry
• Battlefield Forge
• Reflecting Pool
• Drowned Catacomb
• Isolated Chapel
• Underground River
• Turbulent Crater
• Caves of Koilos
• Contaminated Landscape
• Sulfurous Springs
• Clifftop Retreat
• 2× Mountain
• Perilous Landscape
• Fabled Passage
• Sulfur Falls
• Shivan Reef
• Radiant Summit
• 2× Plains
• 3× Island
• 2× Swamp
• Flawless Maneuver
• Grand Crescendo
• Talisman of Indulgence