Confidence:StrongSolidPlausibleTentativeSpeculative

• Zur, Eternal Schemer

  WUB

  Legendary Creature — Human WizardBUW

  Damage + lifelink: lifelink converts damage on one side into life triggers the partner pays off — the canonical Heliod / Karlov family.
• Soulfire Grand Master

  1W

  Creature — Human MonkRUW

  Damage + lifelink: lifelink converts damage on one side into life triggers the partner pays off — the canonical Heliod / Karlov family.
• Whip of Erebos

  2BB

  Legendary Enchantment ArtifactB

  Damage + lifelink: lifelink converts damage on one side into life triggers the partner pays off — the canonical Heliod / Karlov family.
• 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.
• Ezrim, Agency Chief

  1WWUU

  Legendary Creature — Archon DetectiveUW

  Damage + lifelink: lifelink converts damage on one side into life triggers the partner pays off — the canonical Heliod / Karlov family.
• The Destined White Mage

  2W

  Legendary Creature — Human ClericW

  Damage + lifelink: lifelink converts damage on one side into life triggers the partner pays off — the canonical Heliod / Karlov family.
• Assassin Initiate

  B

  Creature — Human AssassinB

  Damage + lifelink: lifelink converts damage on one side into life triggers the partner pays off — the canonical Heliod / Karlov family.
• Brightling

  1WW

  Creature — ShapeshifterW

  Damage + lifelink: lifelink converts damage on one side into life triggers the partner pays off — the canonical Heliod / Karlov family.
• 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.
• Viper, Cruel Conspirator

  1B

  Legendary Creature — Human Assassin VillainB

  Damage + lifelink: lifelink converts damage on one side into life triggers the partner pays off — the canonical Heliod / Karlov family.
• 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.
• Shadowspear

  1

  Legendary Artifact — EquipmentC

  Damage + lifelink: lifelink converts damage on one side into life triggers the partner pays off — the canonical Heliod / Karlov family.
• Nectar Faerie

  1B

  Creature — Faerie WizardB

  Damage + lifelink: lifelink converts damage on one side into life triggers the partner pays off — the canonical Heliod / Karlov family.
• Prakhata Pillar-Bug

  3

  Artifact Creature — InsectB

  Damage + lifelink: lifelink converts damage on one side into life triggers the partner pays off — the canonical Heliod / Karlov family.
• Fell Gravship

  2B

  Artifact — SpacecraftB

  Damage + lifelink: lifelink converts damage on one side into life triggers the partner pays off — the canonical Heliod / Karlov family.
• Arctic Aven

  2U

  Creature — Bird WizardUW

  Damage + lifelink: lifelink converts damage on one side into life triggers the partner pays off — the canonical Heliod / Karlov family.
• Batterskull

  5

  Artifact — EquipmentC

  Damage + lifelink: lifelink converts damage on one side into life triggers the partner pays off — the canonical Heliod / Karlov family.
• Volrath's Gardens

  1G

  EnchantmentG

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Valentin, Dean of the Vein // Lisette, Dean of the Root

  B2GG

  Legendary Creature — Vampire Warlock // Legendary Creature — Human DruidBG

  Both cards trigger on life gain — they fire together.
• Copperhorn Scout

  G

  Creature — Elf ScoutG

  Copperhorn Scout untaps all (or many) permanents, refreshing Prize Pig's tap activation.
• Nazar, the Velvet Fang

  3B

  Legendary Creature — Vampire WarlockB

  Both cards trigger on life gain — they fire together.
• Karlov of the Ghost Council

  WB

  Legendary Creature — Spirit AdvisorBW

  Both cards trigger on life gain — they fire together.
• Elvish Scout

  G

  Creature — Elf ScoutG

  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.
• White Plume Adventurer

  2W

  Creature — Orc ClericW

  White Plume Adventurer untaps all (or many) permanents, refreshing Prize Pig's tap activation.
• Amalia Benavides Aguirre

  WB

  Legendary Creature — Vampire ScoutBW

  Both cards trigger on life gain — they fire together.