Confidence:StrongSolidPlausibleTentativeSpeculative

• Crackleburr

  1U/RU/R

  Creature — ElementalRU

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Rem Karolus, Stalwart Slayer

  1RW

  Legendary Creature — Human KnightRW

  Damage pair: both cards convert effects into damage. They stack in a damage-heavy deck; on their own they're a value engine, not a closed loop.
• Quicksilver Dagger

  1UR

  Enchantment — AuraRU

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

  XRR

  Creature — ElementalR

  Damage pair: both cards convert effects into damage. They stack in a damage-heavy deck; on their own they're a value engine, not a closed loop.
• Wolfhunter's Quiver

  1

  Artifact — EquipmentC

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

  WWWW

  Creature — Phyrexian HorrorW

  Damage pair: both cards convert effects into damage. They stack in a damage-heavy deck; on their own they're a value engine, not a closed loop.
• Heavy Arbalest

  3

  Artifact — EquipmentC

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

  1R

  Enchantment — AuraR

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

  1R

  Creature — Human SoldierR

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

  1R

  Enchantment — AuraR

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

  1U

  Enchantment — AuraU

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

  1R

  Enchantment — AuraR

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

  1U

  Enchantment — AuraU

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

  2R

  Enchantment — AuraR

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

  1

  Artifact — EquipmentC

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

  3WWW

  Creature — Avatar IncarnationW

  Damage pair: both cards convert effects into damage. They stack in a damage-heavy deck; on their own they're a value engine, not a closed loop.
• Viridian Longbow

  1

  Artifact — EquipmentC

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

  1

  Artifact — EquipmentC

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

  2R

  Enchantment — AuraRU

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

  2R

  Enchantment — AuraR

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

  1

  Artifact — EquipmentC

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

  4R

  Enchantment — AuraR

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

  3

  Artifact — EquipmentC

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

  1WU

  Creature — Human Cleric ArcherUW

  Damage pair: both cards convert effects into damage. They stack in a damage-heavy deck; on their own they're a value engine, not a closed loop.
• Sorcerer's Wand

  1

  Artifact — EquipmentC

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