Confidence:StrongSolidPlausibleTentativeSpeculative

• Mikaeus, the Unhallowed✓

  3BBB

  Legendary Creature — Zombie ClericB

  Death replacement: a death-replacement grant on one card lets the other repeatedly die-and-return for combo (Mikaeus + Walking Ballista class).
• Humility

  2WW

  EnchantmentW

  Toughness wipe: one card sets every other creature's base toughness to 1 (or another small number), and the other repeatedly kills anything that small — a standing -1/-1, damage to each creature, or a pinger that untaps when a creature dies. Together they wipe the board and kill whatever enters after (once, if the toughness change only lasts the turn).
• Vizier of Remedies

  1W

  Creature — Human ClericW

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Maha, Its Feathers Night

  3BB

  Legendary Creature — Elemental BirdB

  Toughness wipe: one card sets every other creature's base toughness to 1 (or another small number), and the other repeatedly kills anything that small — a standing -1/-1, damage to each creature, or a pinger that untaps when a creature dies. Together they wipe the board and kill whatever enters after (once, if the toughness change only lasts the turn).
• Overwhelming Splendor

  6WW

  Enchantment — Aura CurseW

  Toughness wipe: one card sets every other creature's base toughness to 1 (or another small number), and the other repeatedly kills anything that small — a standing -1/-1, damage to each creature, or a pinger that untaps when a creature dies. Together they wipe the board and kill whatever enters after (once, if the toughness change only lasts the turn).
• Godhead of Awe

  W/UW/UW/UW/UW/U

  Creature — Spirit AvatarUW

  Toughness wipe: one card sets every other creature's base toughness to 1 (or another small number), and the other repeatedly kills anything that small — a standing -1/-1, damage to each creature, or a pinger that untaps when a creature dies. Together they wipe the board and kill whatever enters after (once, if the toughness change only lasts the turn).
• Bloodline Recollector // Ancestral Craving

  1BB

  Creature — Vampire Warlock // InstantB

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Bloodline Recollector's death-trigger or removal payoff.
• Chevill, Bane of Monsters

  BG

  Legendary Creature — Human RogueBG

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Chevill, Bane of Monsters's death-trigger or removal payoff.
• Private Research

  U

  Enchantment — AuraU

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Private Research's death-trigger or removal payoff.
• Quest for the Gravelord

  B

  EnchantmentB

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Quest for the Gravelord's death-trigger or removal payoff.
• Bequeathal

  G

  Enchantment — AuraG

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Bequeathal's death-trigger or removal payoff.
• Kraven the Hunter

  1BG

  Legendary Creature — Human Warrior VillainBG

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Kraven the Hunter's death-trigger or removal payoff.
• Lagomos, Hand of Hatred

  1BR

  Legendary Creature — Human ShamanBR

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Lagomos, Hand of Hatred's death-trigger or removal payoff.
• Enduring Renewal

  2WW

  EnchantmentW

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Enduring Renewal's death-trigger or removal payoff.
• Eater of Virtue

  1

  Legendary Artifact — EquipmentC

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Eater of Virtue's death-trigger or removal payoff.
• Skullclamp

  1

  Artifact — EquipmentC

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Skullclamp's death-trigger or removal payoff.
• Malicious Affliction

  BB

  InstantB

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Malicious Affliction's death-trigger or removal payoff.
• Athreos, God of Passage

  1WB

  Legendary Enchantment Creature — GodBW

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Athreos, God of Passage's death-trigger or removal payoff.
• Emeritus of Woe // Demonic Tutor

  3B1B

  Creature — Vampire Warlock // SorceryB

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Emeritus of Woe's death-trigger or removal payoff.
• Ob Nixilis, Unshackled

  4BB

  Legendary Creature — DemonB

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Ob Nixilis, Unshackled's death-trigger or removal payoff.
• Glissa, the Traitor

  BGG

  Legendary Creature — Phyrexian Zombie ElfBG

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Glissa, the Traitor's death-trigger or removal payoff.
• Incendiary

  R

  Enchantment — AuraR

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Incendiary's death-trigger or removal payoff.
• The Meathook Massacre

  XBB

  Legendary EnchantmentB

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling The Meathook Massacre's death-trigger or removal payoff.
• Assault Intercessor

  1WB

  Creature — Astartes WarriorBW

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Assault Intercessor's death-trigger or removal payoff.
• Nurgle's Rot

  B

  Enchantment — AuraB

  Carnifex Demon can kill creatures (with damage or by shrinking them), enabling Nurgle's Rot's death-trigger or removal payoff.