Confidence:StrongSolidPlausibleTentativeSpeculative

• Esper Sojourners

  WUB

  Artifact Creature — Vedalken WizardBUW

  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.
• Intellectual Offering

  4U

  InstantU

  Intellectual Offering untaps all (or many) permanents, refreshing Oni-Cult Anvil's tap activation.
• Stone Idol Trap

  5R

  Instant — TrapR

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

  2U

  EnchantmentU

  Unstoppable Plan untaps all (or many) permanents, refreshing Oni-Cult Anvil's tap activation.
• Dragon Man, Reformed Robot

  2WU

  Legendary Artifact Creature — Dragon RobotUW

  Recursion engine: one card can reanimate repeatedly (an activated ability, or a return that comes back once a turn), and the other is a creature worth bringing back again and again — or a creature you recast from your graveyard beside a sacrifice outlet that doesn't pay for the recast. Real, repeatable value — not an infinite loop on its own.
• Unwinding Clock

  4

  ArtifactC

  Unwinding Clock untaps all (or many) permanents, refreshing Oni-Cult Anvil's tap activation.
• Seedborn Muse

  3GG

  Creature — SpiritG

  Seedborn Muse untaps all (or many) permanents, refreshing Oni-Cult Anvil's tap activation.
• Paradox Engine

  5

  Legendary ArtifactC

  Paradox Engine untaps all (or many) permanents, refreshing Oni-Cult Anvil's tap activation.
• Mordor Trebuchet

  2B

  Artifact Creature — WallB

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

  1U

  InstantU

  Dramatic Reversal untaps all (or many) permanents, refreshing Oni-Cult Anvil's tap activation.
• Gemini Engine

  6

  Artifact Creature — ConstructC

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

  12UU

  InstantU

  Blinkmoth Infusion untaps all (or many) permanents, refreshing Oni-Cult Anvil's tap activation.
• Karn, Scion of Urza

  4

  Legendary Planeswalker — KarnC

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

  1R

  Creature — Goblin ArtificerR

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

  Enchantment Land — Urza's SagaC

  Both cards produce the same kind of effect (shared token subtype).
• Daretti, Ingenious Iconoclast

  1BR

  Legendary Planeswalker — DarettiBR

  Both cards produce the same kind of effect (shared token subtype).
• Jan Jansen, Chaos Crafter

  RWB

  Legendary Creature — Gnome ArtificerBRW

  Both cards produce the same kind of effect (shared token subtype).
• Ancient Stone Idol

  10

  Artifact Creature — GolemC

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

  1

  ArtifactC

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

  3WW

  Legendary Creature — Avatar WizardW

  Gandalf the White makes Oni-Cult Anvil's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Biotech Specialist

  RG

  Creature — Insect ScientistGR

  Oni-Cult Anvil is a sacrifice outlet, enabling Biotech Specialist's death or sacrifice trigger.
• Exuberant Fuseling

  R

  Creature — Phyrexian Goblin WarriorR

  Oni-Cult Anvil is a sacrifice outlet, enabling Exuberant Fuseling's death or sacrifice trigger.
• Skittering Precursor

  2R

  Creature — Eldrazi DroneR

  Oni-Cult Anvil is a sacrifice outlet, enabling Skittering Precursor's death or sacrifice trigger.
• Shard of the Void Dragon

  4BBB

  Creature — C'tanB

  Oni-Cult Anvil is a sacrifice outlet, enabling Shard of the Void Dragon's death or sacrifice trigger.
• Metallurgic Summonings

  3UU

  EnchantmentU

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