Confidence:StrongSolidPlausibleTentativeSpeculative

• Fugitive Codebreaker

  1R

  Creature — Goblin RogueR

  Spellbook is a free spell, so Fugitive Codebreaker's cast trigger fires for nothing.
• Emberheart Challenger

  1R

  Creature — Mouse WarriorR

  Spellbook is a free spell, so Emberheart Challenger's cast trigger fires for nothing.
• Drake Hatcher

  1U

  Creature — Human WizardU

  Spellbook is a free spell, so Drake Hatcher's cast trigger fires for nothing.
• Variable Chaser // Arc of Fortune

  2U2U

  Creature — Human Wizard // SorceryU

  Spellbook is a free spell, so Variable Chaser's cast trigger fires for nothing.
• Harmonic Prodigy

  1R

  Creature — Human WizardR

  Spellbook is a free spell, so Harmonic Prodigy's cast trigger fires for nothing.
• Sokka, Tenacious Tactician

  1URW

  Legendary Creature — Human Warrior AllyRUW

  Spellbook is a free spell, so Sokka, Tenacious Tactician's cast trigger fires for nothing.
• Monastery Swiftspear

  R

  Creature — Human MonkR

  Spellbook is a free spell, so Monastery Swiftspear's cast trigger fires for nothing.
• Stormcatch Mentor

  UR

  Creature — Otter WizardRU

  Spellbook is a free spell, so Stormcatch Mentor's cast trigger fires for nothing.
• Master Pakku

  1U

  Legendary Creature — Human Advisor AllyU

  Spellbook is a free spell, so Master Pakku's cast trigger fires for nothing.
• Voyage Home

  5WU

  SorceryUW

  Spellbook is a free artifact, so Voyage Home's affinity cost drops the moment it is on the battlefield.
• Eris, Roar of the Storm

  8UR

  Legendary Creature — Elemental WarlockRU

  Spellbook is a free spell, so Eris, Roar of the Storm's cast trigger fires for nothing.
• Monica Rambeau // Photon, Living Light

  2W2RWW

  Legendary Creature — Human Hero // Legendary Creature — Elemental HeroRW

  Spellbook is a free spell, so Monica Rambeau's cast trigger fires for nothing.
• Curious Homunculus // Voracious Reader

  1U

  Creature — Homunculus // Creature — Eldrazi HomunculusU

  Spellbook is a free spell, so Curious Homunculus's cast trigger fires for nothing.
• Refurbished Familiar

  3B

  Artifact Creature — Zombie RatB

  Spellbook is a free artifact, so Refurbished Familiar's affinity cost drops the moment it is on the battlefield.
• Monastery Mentor

  2W

  Creature — Human MonkW

  Spellbook is a free spell, so Monastery Mentor's cast trigger fires for nothing.
• Stormchaser Mage

  UR

  Creature — Human WizardRU

  Spellbook is a free spell, so Stormchaser Mage's cast trigger fires for nothing.
• Emry, Lurker of the Loch

  2U

  Legendary Creature — Merfolk WizardU

  Spellbook is a free artifact, so Emry, Lurker of the Loch's affinity cost drops the moment it is on the battlefield.
• Elsha of the Infinite

  2URW

  Legendary Creature — Djinn MonkRUW

  Spellbook is a free spell, so Elsha of the Infinite's cast trigger fires for nothing.
• Assert Authority

  5UU

  InstantU

  Spellbook is a free artifact, so Assert Authority's affinity cost drops the moment it is on the battlefield.
• Sage-Eye Avengers

  4UU

  Creature — Djinn MonkU

  Spellbook is a free spell, so Sage-Eye Avengers's cast trigger fires for nothing.
• Kitsa, Otterball Elite

  1U

  Legendary Creature — Otter WizardU

  Spellbook is a free spell, so Kitsa, Otterball Elite's cast trigger fires for nothing.
• Daring Sleuth // Bearer of Overwhelming Truths

  1U

  Creature — Human Rogue // Creature — Human WizardU

  Spellbook is a free spell, so Daring Sleuth's cast trigger fires for nothing.
• Thoughtcast

  4U

  SorceryU

  Spellbook is a free artifact, so Thoughtcast's affinity cost drops the moment it is on the battlefield.
• Jeskai Sage

  1U

  Creature — Human MonkU

  Spellbook is a free spell, so Jeskai Sage's cast trigger fires for nothing.
• Thought Monitor

  6U

  Artifact Creature — ConstructU

  Spellbook is a free artifact, so Thought Monitor's affinity cost drops the moment it is on the battlefield.