Confidence:StrongSolidPlausibleTentativeSpeculative

• Gurgling Anointer

  2B

  Creature — Phyrexian HorrorB

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

  4UU

  Creature — KrakenU

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Thornbite Staff

  2

  Kindred Artifact — Shaman EquipmentC

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Teferi, Temporal Pilgrim

  3UU

  Legendary Planeswalker — TeferiU

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

  G

  Creature — Elf ScoutG

  Copperhorn Scout untaps all (or many) permanents, refreshing Thraxodemon's tap activation.
• White Plume Adventurer

  2W

  Creature — Orc ClericW

  White Plume Adventurer untaps all (or many) permanents, refreshing Thraxodemon's tap activation.
• Red Ghost, Intangible Genius

  2UR

  Legendary Creature — Human Scientist VillainRU

  Draw pair: both cards engage with card draw. With a damage-or-draw trigger between them they form a draw engine.
• Jace, Ingenious Mind-Mage

  4UU

  Legendary Planeswalker — JaceU

  Jace, Ingenious Mind-Mage untaps all (or many) permanents, refreshing Thraxodemon's tap activation.
• Aggravated Assault

  2R

  EnchantmentR

  Aggravated Assault untaps all (or many) permanents, refreshing Thraxodemon's tap activation.
• The Thirteenth Doctor

  1GU

  Legendary Creature — Time Lord DoctorGU

  The Thirteenth Doctor untaps all (or many) permanents, refreshing Thraxodemon's tap activation.
• Veteran Beastrider

  1GW

  Creature — Human KnightGW

  Veteran Beastrider untaps all (or many) permanents, refreshing Thraxodemon's tap activation.
• Jolrael, Mwonvuli Recluse

  1G

  Legendary Creature — Human DruidG

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

  2U

  EnchantmentU

  Intruder Alarm untaps all (or many) permanents, refreshing Thraxodemon's tap activation.
• Drumbellower

  2W

  Creature — SpiritW

  Drumbellower untaps all (or many) permanents, refreshing Thraxodemon's tap activation.
• Gideon, Martial Paragon

  4W

  Legendary Planeswalker — GideonW

  Gideon, Martial Paragon untaps all (or many) permanents, refreshing Thraxodemon's tap activation.
• Mischievous Mystic

  1U

  Creature — Human WizardU

  Draw pair: both cards engage with card draw. With a damage-or-draw trigger between them they form a draw engine.
• Daughter of the Deep

  1U

  Creature — Merfolk NobleU

  Draw pair: both cards engage with card draw. With a damage-or-draw trigger between them they form a draw engine.
• The Council of Four

  3WU

  Legendary Creature — Human NobleUW

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

  4UR

  Legendary Creature — GodRU

  Draw pair: both cards engage with card draw. With a damage-or-draw trigger between them they form a draw engine.
• Dazzling Theater // Prop Room

  3W2W

  Enchantment — Room // Enchantment — RoomW

  Dazzling Theater untaps all (or many) permanents, refreshing Thraxodemon's tap activation.
• Intellectual Offering

  4U

  InstantU

  Intellectual Offering untaps all (or many) permanents, refreshing Thraxodemon's tap activation.
• Prophet of Kruphix

  3GU

  Creature — Human WizardGU

  Prophet of Kruphix untaps all (or many) permanents, refreshing Thraxodemon's tap activation.
• Éomer, Marshal of Rohan

  2RR

  Legendary Creature — Human KnightR

  Éomer, Marshal of Rohan untaps all (or many) permanents, refreshing Thraxodemon's tap activation.
• Ivorytusk Fortress

  2WBG

  Creature — ElephantBGW

  Ivorytusk Fortress untaps all (or many) permanents, refreshing Thraxodemon's tap activation.
• Unstoppable Plan

  2U

  EnchantmentU

  Unstoppable Plan untaps all (or many) permanents, refreshing Thraxodemon's tap activation.

• WithTolarian Kraken4UUU

  Untap loop: each card untaps the other, generating arbitrary activations or mana. These two can't keep the loop going alone — add one of these to complete it:

  Nurgle's RotBMischievous Mystic1UDaughter of the Deep1UGenestealer Patriarch4UAvacyn's Collar1Fishing Pole1
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• WithThornbite Staff2C

  Untap loop: each card untaps the other, generating arbitrary activations or mana. These two can't keep the loop going alone — add one of these to complete it:

  Nurgle's RotBMindless Conscription2BBaloth Prime3GEmrakul's Messenger1UAvacyn's Collar1Fishing Pole1
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