Confidence:StrongSolidPlausibleTentativeSpeculative

• Court of Vantress

  2UU

  EnchantmentU

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Terra, Magical Adept // Esper Terra

  1RG

  Legendary Creature — Human Wizard Warrior // Legendary Enchantment Creature — Saga WizardBGRUW

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Mirror Room // Fractured Realm

  2U5UU

  Enchantment — Room // Enchantment — RoomU

  Mirror Room makes The Day of the Doctor's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Estrid's Invocation

  2U

  EnchantmentU

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Calix, Guided by Fate

  1GW

  Legendary Enchantment Creature — Human DruidGW

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Yenna, Redtooth Regent

  2GW

  Legendary Creature — Elf NobleGW

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Ondu Spiritdancer

  4W

  Creature — Kor ClericW

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Copy Enchantment

  2U

  EnchantmentU

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Adagia, Windswept Bastion

  Land — PlanetW

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Three Dog, Galaxy News DJ

  1RW

  Legendary Creature — Human BardRW

  Three Dog, Galaxy News DJ creates token copies, feeding The Day of the Doctor's ETB or copy payoff.
• Song of Creation

  1GUR

  EnchantmentGRU

  The Day of the Doctor lets you cast/play from exile, enabling Song of Creation's exile-recursion loop.
• Baron Helmut Zemo

  BBB

  Legendary Creature — Human Noble VillainB

  The Day of the Doctor lets you cast/play from exile, enabling Baron Helmut Zemo's exile-recursion loop.
• Hydro-Man, Fluid Felon

  UU

  Legendary Creature — Elemental VillainU

  The Day of the Doctor lets you cast/play from exile, enabling Hydro-Man, Fluid Felon's exile-recursion loop.
• Temporal Extortion

  BBBB

  SorceryB

  The Day of the Doctor lets you cast/play from exile, enabling Temporal Extortion's exile-recursion loop.
• Shanid, Sleepers' Scourge

  1RWB

  Legendary Creature — Human KnightBRW

  The Day of the Doctor lets you cast/play from exile, enabling Shanid, Sleepers' Scourge's exile-recursion loop.
• Quintorius Kand

  3RW

  Legendary Planeswalker — QuintoriusRW

  The Day of the Doctor lets you cast/play from exile, enabling Quintorius Kand's exile-recursion loop.
• The Circle of Loyalty

  4WW

  Legendary ArtifactW

  The Day of the Doctor lets you cast/play from exile, enabling The Circle of Loyalty's exile-recursion loop.
• Jodah, the Unifier

  WUBRG

  Legendary Creature — Human WizardBGRUW

  The Day of the Doctor lets you cast/play from exile, enabling Jodah, the Unifier's exile-recursion loop.
• Kozilek, Butcher of Truth

  10

  Legendary Creature — EldraziC

  The Day of the Doctor lets you cast/play from exile, enabling Kozilek, Butcher of Truth's exile-recursion loop.
• Kasla, the Broken Halo

  3URW

  Legendary Creature — Angel AllyRUW

  The Day of the Doctor lets you cast/play from exile, enabling Kasla, the Broken Halo's exile-recursion loop.
• Lavinia, Foil to Conspiracy

  1W/UW/U

  Legendary Creature — Human DetectiveUW

  The Day of the Doctor lets you cast/play from exile, enabling Lavinia, Foil to Conspiracy's exile-recursion loop.
• Runaway Steam-Kin

  1R

  Creature — ElementalR

  The Day of the Doctor lets you cast/play from exile, enabling Runaway Steam-Kin's exile-recursion loop.
• Dash Hopes

  BB

  InstantB

  The Day of the Doctor lets you cast/play from exile, enabling Dash Hopes's exile-recursion loop.
• Fire Lord Zuko

  RWB

  Legendary Creature — Human Noble AllyBRW

  The Day of the Doctor lets you cast/play from exile, enabling Fire Lord Zuko's exile-recursion loop.
• Malcolm, the Eyes

  UR

  Legendary Creature — Siren PirateRU

  The Day of the Doctor lets you cast/play from exile, enabling Malcolm, the Eyes's exile-recursion loop.