Confidence:StrongSolidPlausibleTentativeSpeculative

• Roaming Throne

  4

  Artifact Creature — GolemC

  Roaming Throne makes Inspired Tethermage's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• The Great Goblin

  1B/RB/R

  Legendary Creature — Goblin NobleBR

  Both cards trigger when a counter is placed — they fire together.
• Mirror Room // Fractured Realm

  2U5UU

  Enchantment — Room // Enchantment — RoomU

  Mirror Room makes Inspired Tethermage's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Bioessence Hydra

  3GU

  Creature — Hydra MutantGU

  Both cards trigger when a counter is placed — they fire together.
• Wizard's Staff

  1U

  Artifact — EquipmentU

  Wizard's Staff makes Inspired Tethermage's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• All Will Be One

  3RR

  EnchantmentR

  Both cards trigger when a counter is placed — they fire together.
• Helping Hand

  W

  SorceryW

  Helping Hand puts Inspired Tethermage onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Unearth

  B

  SorceryB

  Unearth puts Inspired Tethermage onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Shifting Woodland

  LandG

  Graveyard copier: one card stocks the graveyard (mill, surveil, dredge) and the other can repeatedly become a copy of a card that's there, borrowing its abilities without recasting it — the Shifting Woodland + Aftermath Analyst shape.
• Reanimate

  B

  SorceryB

  Reanimate puts Inspired Tethermage onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Fiery Gambit

  2R

  SorceryR

  Fiery Gambit untaps lands, fueling Inspired Tethermage's mana-hungry effect.
• Grave Researcher // Reanimate

  2BB

  Creature — Troll Warlock // SorceryB

  Grave Researcher puts Inspired Tethermage onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Innocuous Researcher

  3G

  Creature — Centaur DetectiveG

  Innocuous Researcher untaps lands, fueling Inspired Tethermage's mana-hungry effect.
• Time Spiral

  4UU

  SorceryU

  Time Spiral untaps lands, fueling Inspired Tethermage's mana-hungry effect.
• Can't Stay Away

  WB

  SorceryBW

  Can't Stay Away puts Inspired Tethermage onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Priest of Fell Rites

  WB

  Creature — Human WarlockBW

  Priest of Fell Rites puts Inspired Tethermage onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Nissa, Vastwood Seer // Nissa, Sage Animist

  2G

  Legendary Creature — Elf Scout // Legendary Planeswalker — NissaG

  Nissa, Vastwood Seer untaps lands, fueling Inspired Tethermage's mana-hungry effect.
• Resistance Is Futile

  1B

  SorceryB

  Resistance Is Futile puts Inspired Tethermage onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Animate Dead

  1B

  Enchantment — AuraB

  Animate Dead puts Inspired Tethermage onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Exhume

  1B

  SorceryB

  Exhume puts Inspired Tethermage onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Return Triumphant

  1W

  SorceryW

  Return Triumphant puts Inspired Tethermage onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Life // Death

  G1B

  Sorcery // SorceryBG

  Life puts Inspired Tethermage onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Elrond, Moon-Reader

  2U

  Legendary Creature — Elf NobleU

  Inspired Tethermage has activated abilities that aren't mana abilities, fueling Elrond, Moon-Reader's activation-trigger.
• Dance of the Dead

  1B

  Enchantment — AuraB

  Dance of the Dead puts Inspired Tethermage onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Recommission

  1W

  SorceryW

  Recommission puts Inspired Tethermage onto the battlefield from a graveyard without casting it, so its mana cost is never paid.