Confidence:StrongSolidPlausibleTentativeSpeculative

• Roaming Throne

  4

  Artifact Creature — GolemC

  Roaming Throne makes A-Geology Enthusiast's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Mirror Room // Fractured Realm

  2U5UU

  Enchantment — Room // Enchantment — RoomU

  Mirror Room makes A-Geology Enthusiast's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Wizard's Staff

  1U

  Artifact — EquipmentU

  Wizard's Staff makes A-Geology Enthusiast's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• The Soul Stone

  1B

  Legendary Artifact — Infinity StoneB

  Mana loop: net-positive mana cycle between the two cards.
• Ojer Taq, Deepest Foundation // Temple of Civilization

  4WW

  Legendary Creature — God // LandW

  Mana loop: net-positive mana cycle between the two cards.
• Reanimate

  B

  SorceryB

  Reanimate puts A-Geology Enthusiast onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Aclazotz, Deepest Betrayal // Temple of the Dead

  3BB

  Legendary Creature — Bat God // LandB

  Mana loop: net-positive mana cycle between the two cards.
• Grave Researcher // Reanimate

  2BB

  Creature — Troll Warlock // SorceryB

  Grave Researcher puts A-Geology Enthusiast onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Currency Converter

  1

  ArtifactC

  Mana loop: net-positive mana cycle between the two cards.
• Wizard's Rockets

  1

  ArtifactC

  Mana loop: net-positive mana cycle between the two cards.
• Intrepid Paleontologist

  1G

  Creature — Human DruidG

  Mana loop: net-positive mana cycle between the two cards.
• Reckless Lackey

  R

  Creature — Goblin PirateR

  Mana loop: net-positive mana cycle between the two cards.
• Priest of Fell Rites

  WB

  Creature — Human WarlockBW

  Priest of Fell Rites puts A-Geology Enthusiast onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Ashnod, Flesh Mechanist

  B

  Legendary Creature — Human ArtificerB

  Mana loop: net-positive mana cycle between the two cards.
• Thornvault Forager

  1G

  Creature — Squirrel RangerG

  Mana loop: net-positive mana cycle between the two cards.
• Sidequest: Catch a Fish // Cooking Campsite

  2W

  Enchantment // LandW

  Mana loop: net-positive mana cycle between the two cards.
• Gilded Goose

  G

  Creature — BirdG

  Mana loop: net-positive mana cycle between the two cards.
• Fire Nation Cadets

  R

  Creature — Human SoldierR

  Mana loop: net-positive mana cycle between the two cards.
• Jadzia Dax, Living Legacy

  1G

  Legendary Creature — Trill ScientistG

  Mana loop: net-positive mana cycle between the two cards.
• The Mind Stone

  1W

  Legendary Artifact — Infinity StoneW

  Mana loop: net-positive mana cycle between the two cards.
• Restless Fortress

  LandBW

  Mana loop: net-positive mana cycle between the two cards.
• Frog Butler

  1G

  Creature — Frog SpiritG

  Mana loop: net-positive mana cycle between the two cards.
• Dal R'El, Augment Orphan

  1RG

  Legendary Creature — Human Mutant RogueGR

  Mana loop: net-positive mana cycle between the two cards.
• Ojer Axonil, Deepest Might // Temple of Power

  2RR

  Legendary Creature — God // LandR

  Mana loop: net-positive mana cycle between the two cards.
• Life // Death

  G1B

  Sorcery // SorceryBG

  Life puts A-Geology Enthusiast onto the battlefield from a graveyard without casting it, so its mana cost is never paid.