Confidence:StrongSolidPlausibleTentativeSpeculative

• Lullmage Mentor

  1UU

  Creature — Merfolk WizardU

  One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
• Benthicore

  6U

  Creature — ElementalU

  One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
• Emperor Mihail II

  1UU

  Legendary Creature — Merfolk NobleU

  Both cards produce the same kind of effect (shared token subtype).
• Merrow Commerce

  1U

  Kindred Enchantment — MerfolkU

  Merrow Commerce untaps all (or many) permanents, refreshing Summon the School's tap activation.
• Daughter of the Deep

  1U

  Creature — Merfolk NobleU

  Both cards produce the same kind of effect (shared token subtype).
• Deepway Navigator

  WU

  Creature — Merfolk WizardUW

  Deepway Navigator untaps all (or many) permanents, refreshing Summon the School's tap activation.
• Namor, Atlantean King

  1WU

  Legendary Creature — Mutant Merfolk NobleUW

  Both cards produce the same kind of effect (shared token subtype).
• Stormsplitter

  3R

  Creature — Otter WizardR

  Both cards produce the same kind of effect (shared token subtype).
• Docent of Perfection // Final Iteration

  3UU

  Creature — Insect Horror // Creature — Eldrazi InsectU

  Both cards produce the same kind of effect (shared token subtype).
• Namor the Sub-Mariner

  1UU

  Legendary Creature — Mutant Merfolk VillainU

  Both cards produce the same kind of effect (shared token subtype).
• Circle of Power

  3B

  SorceryB

  Both cards produce the same kind of effect (shared token subtype).
• Inalla, Archmage Ritualist

  2UBR

  Legendary Creature — Human WizardBRU

  Both cards produce the same kind of effect (shared token subtype).
• Aquatic Incursion

  3U

  EnchantmentU

  Both cards produce the same kind of effect (shared token subtype).
• Namora, the Sea Queen

  2U

  Legendary Creature — Mutant Merfolk HeroU

  Both cards produce the same kind of effect (shared token subtype).
• Stonybrook Schoolmaster

  2W

  Creature — Merfolk WizardW

  Both cards produce the same kind of effect (shared token subtype).
• Jungleborn Pioneer

  2G

  Creature — Merfolk ScoutG

  Both cards produce the same kind of effect (shared token subtype).
• Silvergill Mentor

  1U

  Creature — Merfolk WizardU

  Both cards produce the same kind of effect (shared token subtype).
• Deeproot Waters

  2U

  EnchantmentU

  Both cards produce the same kind of effect (shared token subtype).
• Merrow Skyswimmer

  3W/UW/U

  Creature — Merfolk SoldierUW

  Both cards produce the same kind of effect (shared token subtype).
• Deeproot Pilgrimage

  1U

  EnchantmentU

  Both cards produce the same kind of effect (shared token subtype).
• A Killer Among Us

  4G

  EnchantmentG

  Both cards produce the same kind of effect (shared token subtype).
• Wanderwine Farewell

  5UU

  Kindred Sorcery — MerfolkU

  Both cards produce the same kind of effect (shared token subtype).
• Commodore Guff

  1URW

  Legendary Planeswalker — GuffRUW

  Both cards produce the same kind of effect (shared token subtype).
• Kasmina, Enigmatic Mentor

  3U

  Legendary Planeswalker — KasminaU

  Both cards produce the same kind of effect (shared token subtype).
• Coruscation Mage

  1R

  Creature — Otter WizardR

  Both cards produce the same kind of effect (shared token subtype).