Confidence:StrongSolidPlausibleTentativeSpeculative

• Archivist of Gondor

  2U

  Creature — Human AdvisorU

  Both cards trigger on damage dealt — they fire together.
• Sygg, Wanderwine Wisdom // Sygg, Wanderbrine Shield

  1U

  Legendary Creature — Merfolk Wizard // Legendary Creature — Merfolk RogueUW

  Both cards trigger on damage dealt — they fire together.
• Helping Hand

  W

  SorceryW

  Helping Hand puts Headless Specter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Unearth

  B

  SorceryB

  Unearth puts Headless Specter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Nath of the Gilt-Leaf

  3BG

  Legendary Creature — Elf WarriorBG

  Headless Specter makes opponents discard, fueling Nath of the Gilt-Leaf's discard payoff.
• Aclazotz, Deepest Betrayal // Temple of the Dead

  3BB

  Legendary Creature — Bat God // LandB

  Headless Specter makes opponents discard, fueling Aclazotz, Deepest Betrayal's discard payoff.
• The Beast, Deathless Prince

  2BR

  Legendary Creature — DemonBR

  Both cards trigger on damage dealt — they fire together.
• Vraska the Unseen

  3BG

  Legendary Planeswalker — VraskaBG

  Both cards trigger on damage dealt — they fire together.
• The Rani

  1UBR

  Legendary Creature — Time Lord ScientistBRU

  Both cards trigger on damage dealt — they fire together.
• Waste Not

  1B

  EnchantmentB

  Headless Specter makes opponents discard, fueling Waste Not's discard payoff.
• One with Nature

  G

  Enchantment — AuraG

  Both cards trigger on damage dealt — they fire together.
• Gonti, Night Minister

  2BB

  Legendary Creature — Aetherborn RogueB

  Both cards trigger on damage dealt — they fire together.
• Lost Jitte

  1

  Legendary Artifact — EquipmentC

  Both cards trigger on damage dealt — they fire together.
• Felix Five-Boots

  2BGU

  Legendary Creature — Ooze RogueBGU

  Felix Five-Boots makes Headless Specter's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Tinybones, Bauble Burglar

  1B

  Legendary Creature — Skeleton RogueB

  Headless Specter makes opponents discard, fueling Tinybones, Bauble Burglar's discard payoff.
• Puppet Master, String Puller

  2R

  Legendary Creature — Human Artificer VillainR

  Both cards trigger on damage dealt — they fire together.
• Teysa, Envoy of Ghosts

  5WB

  Legendary Creature — Human AdvisorBW

  Both cards trigger on damage dealt — they fire together.
• The Master, Mesmerist

  2UB

  Legendary Creature — Time Lord RogueBU

  Both cards trigger on damage dealt — they fire together.
• All-Out Assault

  2RWB

  EnchantmentBRW

  All-Out Assault grants an extra combat phase, enabling Headless Specter's combat-trigger payoff.
• Tamiyo, Upriser Crowned

  4RW

  Legendary Creature — Moonfolk WarriorRW

  Both cards trigger on damage dealt — they fire together.
• Edric, Spymaster of Trest

  1GU

  Legendary Creature — Elf RogueGU

  Both cards trigger on damage dealt — they fire together.
• Gix, Yawgmoth Praetor

  1BB

  Legendary Creature — Phyrexian PraetorB

  Both cards trigger on damage dealt — they fire together.
• Foot Chopper

  1B

  Artifact — EquipmentB

  Both cards trigger on damage dealt — they fire together.
• Ogre-Head Helm

  1R

  Artifact Creature — Equipment OgreR

  Both cards trigger on damage dealt — they fire together.
• Witch-king of Angmar

  3BB

  Legendary Creature — Wraith NobleB

  Both cards trigger on damage dealt — they fire together.