Confidence:StrongSolidPlausibleTentativeSpeculative

• Ioreth of the Healing House✓

  2U

  Legendary Creature — Human ClericU

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Nature's Chosen

  G

  Enchantment — AuraG

  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.
• Forensic Researcher

  2U

  Creature — Merfolk DetectiveU

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Kiora's Follower

  GU

  Creature — MerfolkGU

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Ith, High Arcanist

  5WU

  Legendary Creature — Human WizardUW

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Vizier of Tumbling Sands

  2U

  Creature — Human ClericU

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

  2U

  Creature — Vedalken SoldierU

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• D'Vana Tendi, Optimistic Ensign

  1G/UG/U

  Legendary Creature — Orion ScientistGU

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

  2U

  Creature — ElementalU

  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.
• Niblis of the Breath

  2U

  Creature — SpiritU

  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.
• North Pole Patrol

  2U

  Creature — Human Soldier AllyU

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Saheeli, the Sun's Brilliance

  UR

  Legendary Creature — Human ArtificerRU

  Paid copy loop: one card makes copies of a creature, and each copy readies the copier to copy again — but a copy or the untap costs mana every time. It runs for as long as you can pay: a mana sink, infinite only with infinite mana.
• Trickster Mage

  U

  Creature — Human SpellshaperU

  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.
• Sky Hussar

  3WU

  Creature — Human KnightUW

  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.
• Kelpie Guide

  2U

  Creature — BeastU

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

  1U

  Creature — Merfolk WizardU

  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.
• Fatestitcher

  3U

  Creature — Zombie WizardU

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

  2U

  Creature — Human WizardU

  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.
• Tidewater Minion

  3UU

  Creature — Elemental MinionU

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Captain of the Mists

  2U

  Creature — Human WizardU

  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.
• Nimbleclaw Adept

  3U

  Creature — Dragon WizardU

  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.
• Aura of Dominion

  UU

  Enchantment — AuraU

  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.
• Splinter Twin

  2RR

  Enchantment — AuraR

  Copy chain: one card creates hasty copies of a creature whose ability or ETB the partner exploits — the canonical Kiki-Jiki / Splinter Twin pattern.
• Thornbite Staff

  2

  Kindred Artifact — Shaman EquipmentC

  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.
• Overtaker

  1U

  Creature — Merfolk SpellshaperU

  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.