Confidence:StrongSolidPlausibleTentativeSpeculative

• Spiked Corridor // Torture Pit

  3R3R

  Enchantment — Room // Enchantment — RoomR

  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.
• Tor Wauki the Younger

  3BR

  Legendary Creature — Human ArcherBR

  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.
• Matoc, Lavamancer

  3R

  Legendary Creature — Human Barbarian WizardR

  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.
• Cinder Giant

  3R

  Creature — GiantR

  Deliberate damage: one card deals damage to your own creatures on purpose — a fight, a targeted ping, or a standing effect that hits them every turn — and the other rewards being dealt damage: the enrage pattern.
• Sygg, Wanderwine Wisdom // Sygg, Wanderbrine Shield

  1U

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

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

  B

  SorceryB

  Reanimate puts Frilled Deathspitter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Helping Hand

  W

  SorceryW

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

  B

  SorceryB

  Unearth puts Frilled Deathspitter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Fblthp, Impossibly Lost

  1U

  Legendary Creature — HomunculusU

  Both cards trigger on damage dealt — they fire together.
• Grave Researcher // Reanimate

  2BB

  Creature — Troll Warlock // SorceryB

  Grave Researcher puts Frilled Deathspitter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• 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.
• Cryoshatter

  U

  Enchantment — AuraU

  Both cards trigger on damage dealt — they fire together.
• Sleep Magic

  U

  Enchantment — AuraU

  Both cards trigger on damage dealt — they fire together.
• Wayta, Trainer Prodigy

  RGW

  Legendary Creature — Human WarriorGRW

  Wayta, Trainer Prodigy makes Frilled Deathspitter's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Lost Jitte

  1

  Legendary Artifact — EquipmentC

  Both cards trigger on damage dealt — they fire together.
• Ryusei, the Falling Star

  5R

  Legendary Creature — Dragon SpiritR

  Ryusei, the Falling Star deals damage to many targets, fueling Frilled Deathspitter's damage-payoff trigger.
• Jack of Hearts, Volatile Hero

  1RR

  Legendary Creature — Alien Human HeroR

  Jack of Hearts, Volatile Hero deals damage to many targets, fueling Frilled Deathspitter's damage-payoff trigger.
• Puppet Master, String Puller

  2R

  Legendary Creature — Human Artificer VillainR

  Both cards trigger on damage dealt — they fire together.
• Hammerfist Giant

  4RR

  Creature — Giant WarriorR

  Hammerfist Giant deals damage to many targets, fueling Frilled Deathspitter's damage-payoff trigger.
• Earthshaker

  4RR

  Creature — SpiritR

  Earthshaker deals damage to many targets, fueling Frilled Deathspitter's damage-payoff trigger.
• Exocrine

  X2R

  Creature — TyranidR

  Exocrine deals damage to many targets, fueling Frilled Deathspitter's damage-payoff trigger.
• Witch-king of Angmar

  3BB

  Legendary Creature — Wraith NobleB

  Both cards trigger on damage dealt — they fire together.
• Crater Hellion

  4RR

  Creature — Hellion BeastR

  Crater Hellion deals damage to many targets, fueling Frilled Deathspitter's damage-payoff trigger.
• Swooping Pteranodon

  3RW

  Creature — DinosaurRW

  Swooping Pteranodon produces broad damage that redirects through Frilled Deathspitter into something useful.