Confidence:StrongSolidPlausibleTentativeSpeculative

• Summoner's Sending

  1W

  EnchantmentW

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

  1GGGG

  SorceryG

  Both cards produce the same kind of effect (shared token subtype).
• Antiquities on the Loose

  1WW

  SorceryW

  Both cards produce the same kind of effect (shared token subtype).
• Kykar, Wind's Fury

  1URW

  Legendary Creature — Bird WizardRUW

  Both cards produce the same kind of effect (shared token subtype).
• Quintorius, Loremaster

  3RW

  Legendary Creature — Elephant ClericRW

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

  3RW

  Legendary Creature — Dwarf ClericRW

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

  4U

  InstantU

  Intellectual Offering untaps all (or many) permanents, refreshing Staff of the Storyteller's tap activation.
• Baboon Spirit

  2U

  Creature — Monkey SpiritU

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

  WUB

  EnchantmentBUW

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

  2U

  EnchantmentU

  Unstoppable Plan untaps all (or many) permanents, refreshing Staff of the Storyteller's tap activation.
• Spirit Bonds

  1W

  EnchantmentW

  Both cards produce the same kind of effect (shared token subtype).
• Thalia's Geistcaller

  2W

  Creature — Human ClericW

  Both cards produce the same kind of effect (shared token subtype).
• Oyobi, Who Split the Heavens

  6W

  Legendary Creature — SpiritW

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

  3GG

  Creature — SpiritG

  Seedborn Muse untaps all (or many) permanents, refreshing Staff of the Storyteller's tap activation.
• Unwinding Clock

  4

  ArtifactC

  Unwinding Clock untaps all (or many) permanents, refreshing Staff of the Storyteller's tap activation.
• Quintorius, Field Historian

  3RW

  Legendary Creature — Elephant ClericRW

  Both cards produce the same kind of effect (shared token subtype).
• Sekki, Seasons' Guide

  5GGG

  Legendary Creature — SpiritG

  Both cards produce the same kind of effect (shared token subtype).
• Innkeeper's Talent

  1G

  Enchantment — ClassG

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Sorcerer's Broom

  2

  Artifact Creature — SpiritC

  Both cards produce the same kind of effect (shared token subtype).
• Millicent, Restless Revenant

  5WU

  Legendary Creature — Spirit SoldierUW

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

  5

  Legendary ArtifactC

  Paradox Engine untaps all (or many) permanents, refreshing Staff of the Storyteller's tap activation.
• King of the Oathbreakers

  2WB

  Legendary Creature — Spirit NobleBW

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

  U

  Enchantment — ClassU

  Draw pair: both cards engage with card draw. With a damage-or-draw trigger between them they form a draw engine.
• Dramatic Reversal

  1U

  InstantU

  Dramatic Reversal untaps all (or many) permanents, refreshing Staff of the Storyteller's tap activation.
• Drogskol Cavalry

  5WW

  Creature — Spirit KnightW

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