Confidence:StrongSolidPlausibleTentativeSpeculative

• Reanimate

  B

  SorceryB

  Reanimate puts Quagnoth 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

  Both cards trigger when a card is discarded — they fire together.
• Aclazotz, Deepest Betrayal // Temple of the Dead

  3BB

  Legendary Creature — Bat God // LandB

  Both cards trigger when a card is discarded — they fire together.
• Grave Researcher // Reanimate

  2BB

  Creature — Troll Warlock // SorceryB

  Grave Researcher puts Quagnoth onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Priest of Fell Rites

  WB

  Creature — Human WarlockBW

  Priest of Fell Rites puts Quagnoth onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Waste Not

  1B

  EnchantmentB

  Both cards trigger when a card is discarded — they fire together.
• Insidious Roots

  BG

  EnchantmentBG

  Both cards trigger when a card is discarded — they fire together.
• The Ancient One

  UB

  Legendary Creature — Spirit GodBU

  Both cards trigger when a card is discarded — they fire together.
• Animate Dead

  1B

  Enchantment — AuraB

  Animate Dead puts Quagnoth onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Exhume

  1B

  SorceryB

  Exhume puts Quagnoth onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Tinybones, Bauble Burglar

  1B

  Legendary Creature — Skeleton RogueB

  Both cards trigger when a card is discarded — they fire together.
• Life // Death

  G1B

  Sorcery // SorceryBG

  Life puts Quagnoth onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Dance of the Dead

  1B

  Enchantment — AuraB

  Dance of the Dead puts Quagnoth onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Vash, Freelance Archaeologist

  1BG

  Legendary Creature — Human Rogue ScientistBG

  Both cards trigger when a card is discarded — they fire together.
• Persist

  1B

  SorceryB

  Persist puts Quagnoth onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Soul Exchange

  BB

  SorceryB

  Soul Exchange puts Quagnoth onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Tergrid, God of Fright // Tergrid's Lantern

  3BB3B

  Legendary Creature — God // Legendary ArtifactB

  Both cards trigger when a card is discarded — they fire together.
• Entropic Battlecruiser

  3B

  Artifact — SpacecraftB

  Both cards trigger when a card is discarded — they fire together.
• Spiritual Focus

  1W

  EnchantmentW

  Both cards trigger when a card is discarded — they fire together.
• Roaming Throne

  4

  Artifact Creature — GolemC

  Roaming Throne makes Quagnoth's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Fell Specter

  3B

  Creature — SpecterB

  Both cards trigger when a card is discarded — they fire together.
• Invasion of Kaldheim // Pyre of the World Tree

  3R

  Battle — Siege // EnchantmentR

  Both cards trigger when a card is discarded — they fire together.
• Hostile Investigator

  3B

  Creature — Ogre Rogue DetectiveB

  Both cards trigger when a card is discarded — they fire together.
• Erebos's Titan

  1BBB

  Creature — GiantB

  Both cards trigger when a card is discarded — they fire together.
• Liliana's Caress

  1B

  EnchantmentB

  Both cards trigger when a card is discarded — they fire together.