Confidence:StrongSolidPlausibleTentativeSpeculative

• Mirror Room // Fractured Realm

  2U5UU

  Enchantment — Room // Enchantment — RoomU

  Mirror Room makes Barrin's Codex's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Echoes of Eternity

  3CCC

  Kindred Enchantment — EldraziC

  Echoes of Eternity makes Barrin's Codex's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Fiery Gambit

  2R

  SorceryR

  Fiery Gambit untaps lands, fueling Barrin's Codex's mana-hungry effect.
• Innocuous Researcher

  3G

  Creature — Centaur DetectiveG

  Innocuous Researcher untaps lands, fueling Barrin's Codex's mana-hungry effect.
• Stinkweed Imp

  2B

  Creature — ImpB

  Barrin's Codex draws a large number of cards, enabling Stinkweed Imp's draw-payoff or weaponized-draw effect.
• Kid Loki

  U

  Legendary Creature — God Hero VillainU

  Barrin's Codex draws a large number of cards, enabling Kid Loki's draw-payoff or weaponized-draw effect.
• Toothy, Imaginary Friend

  3U

  Legendary Creature — IllusionU

  Barrin's Codex draws a large number of cards, enabling Toothy, Imaginary Friend's draw-payoff or weaponized-draw effect.
• Time Spiral

  4UU

  SorceryU

  Time Spiral untaps lands, fueling Barrin's Codex's mana-hungry effect.
• Red Ghost, Intangible Genius

  2UR

  Legendary Creature — Human Scientist VillainRU

  Barrin's Codex draws a large number of cards, enabling Red Ghost, Intangible Genius's draw-payoff or weaponized-draw effect.
• Sheoldred, the Apocalypse

  2BB

  Legendary Creature — Phyrexian PraetorB

  Barrin's Codex draws a large number of cards, enabling Sheoldred, the Apocalypse's draw-payoff or weaponized-draw effect.
• Nissa, Vastwood Seer // Nissa, Sage Animist

  2G

  Legendary Creature — Elf Scout // Legendary Planeswalker — NissaG

  Nissa, Vastwood Seer untaps lands, fueling Barrin's Codex's mana-hungry effect.
• Niv-Mizzet, Parun

  UUURRR

  Legendary Creature — Dragon WizardRU

  Barrin's Codex draws a large number of cards, enabling Niv-Mizzet, Parun's draw-payoff or weaponized-draw effect.
• Ob Nixilis Reignited

  3BB

  Legendary Planeswalker — NixilisB

  Barrin's Codex draws a large number of cards, enabling Ob Nixilis Reignited's draw-payoff or weaponized-draw effect.
• Teferi, Hero of Dominaria

  3WU

  Legendary Planeswalker — TeferiUW

  Barrin's Codex draws a large number of cards, enabling Teferi, Hero of Dominaria's draw-payoff or weaponized-draw effect.
• Jolrael, Mwonvuli Recluse

  1G

  Legendary Creature — Human DruidG

  Barrin's Codex draws a large number of cards, enabling Jolrael, Mwonvuli Recluse's draw-payoff or weaponized-draw effect.
• Necroplasm

  1BB

  Creature — OozeB

  Barrin's Codex draws a large number of cards, enabling Necroplasm's draw-payoff or weaponized-draw effect.
• Mischievous Mystic

  1U

  Creature — Human WizardU

  Barrin's Codex draws a large number of cards, enabling Mischievous Mystic's draw-payoff or weaponized-draw effect.
• The Council of Four

  3WU

  Legendary Creature — Human NobleUW

  Barrin's Codex draws a large number of cards, enabling The Council of Four's draw-payoff or weaponized-draw effect.
• Worf, Son of Mogh

  1RW

  Legendary Creature — Klingon Warrior OfficerRW

  Barrin's Codex draws a large number of cards, enabling Worf, Son of Mogh's draw-payoff or weaponized-draw effect.
• Niv-Mizzet, the Firemind

  2UURR

  Legendary Creature — Dragon WizardRU

  Barrin's Codex draws a large number of cards, enabling Niv-Mizzet, the Firemind's draw-payoff or weaponized-draw effect.
• Irencrag Pyromancer

  2R

  Creature — Human WizardR

  Barrin's Codex draws a large number of cards, enabling Irencrag Pyromancer's draw-payoff or weaponized-draw effect.
• Knowledge Seeker

  1U

  Creature — Fox SpiritU

  Barrin's Codex draws a large number of cards, enabling Knowledge Seeker's draw-payoff or weaponized-draw effect.
• Rewind

  2UU

  InstantU

  Rewind untaps lands, fueling Barrin's Codex's mana-hungry effect.
• Data, Exploring Humanity

  4U

  Legendary Artifact Creature — Android ScientistU

  Barrin's Codex draws a large number of cards, enabling Data, Exploring Humanity's draw-payoff or weaponized-draw effect.
• The Necrobloom

  1WBG

  Legendary Creature — PlantBGW

  Barrin's Codex draws a large number of cards, enabling The Necrobloom's draw-payoff or weaponized-draw effect.