Confidence:StrongSolidPlausibleTentativeSpeculative

• Extricator of Sin // Extricator of Flesh

  2W

  Creature — Human Cleric // Creature — Eldrazi HorrorW

  Both cards produce the same kind of effect (shared token subtype).
• Drowner of Hope

  5U

  Creature — EldraziU

  Both cards produce the same kind of effect (shared token subtype).
• Writhing Chrysalis

  2RG

  Creature — Eldrazi DroneGR

  Both cards produce the same kind of effect (shared token subtype).
• Idol of False Gods

  2

  Kindred Artifact — EldraziC

  Both cards produce the same kind of effect (shared token subtype).
• Bloodline Recollector // Ancestral Craving

  1BB

  Creature — Vampire Warlock // InstantB

  Spawnsire of Ulamog makes tokens that die on their own (decayed, sacrificed at end of turn or combat), feeding Bloodline Recollector's death trigger or its "if a creature died this turn" condition.
• The Lost and the Damned

  1UR

  EnchantmentRU

  Both cards produce the same kind of effect (shared token subtype).
• Obsessive Pursuit

  1B

  EnchantmentB

  Both cards trigger when a permanent attacks — they fire together.
• Reanimate

  B

  SorceryB

  Reanimate puts Spawnsire of Ulamog onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Bard, Heir of Girion

  2WU

  Legendary Creature — Human ArcherUW

  Both cards trigger when a permanent attacks — they fire together.
• Garruk, Curse Breaker

  3GG

  Legendary Planeswalker — GarrukG

  Both cards trigger when a permanent attacks — they fire together.
• Combat Calligrapher

  3W

  Creature — Bird ClericW

  Both cards trigger when a permanent attacks — they fire together.
• Winota, Joiner of Forces

  2RW

  Legendary Creature — Human WarriorRW

  Both cards trigger when a permanent attacks — they fire together.
• Gallia of the Endless Dance

  RG

  Legendary Creature — SatyrGR

  Both cards trigger when a permanent attacks — they fire together.
• Jon Irenicus, Shattered One

  2UB

  Legendary Creature — Elf WizardBU

  Both cards trigger when a permanent attacks — they fire together.
• Ulamog's Dreadsire

  10

  Creature — EldraziC

  Both cards produce the same kind of effect (shared token subtype).
• Clavileño, First of the Blessed

  1WB

  Legendary Creature — Vampire ClericBW

  Both cards trigger when a permanent attacks — they fire together.
• Grave Researcher // Reanimate

  2BB

  Creature — Troll Warlock // SorceryB

  Grave Researcher puts Spawnsire of Ulamog onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Twenty-Toed Toad

  3U

  Creature — Frog WizardU

  Both cards trigger when a permanent attacks — they fire together.
• Liliana, Death's Majesty

  3BB

  Legendary Planeswalker — LilianaB

  Liliana, Death's Majesty puts Spawnsire of Ulamog onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Lagomos, Hand of Hatred

  1BR

  Legendary Creature — Human ShamanBR

  Spawnsire of Ulamog makes tokens that die on their own (decayed, sacrificed at end of turn or combat), feeding Lagomos, Hand of Hatred's death trigger or its "if a creature died this turn" condition.
• Isshin, Two Heavens as One

  RWB

  Legendary Creature — Human SamuraiBRW

  Isshin, Two Heavens as One makes Spawnsire of Ulamog's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Yore-Tiller Nephilim

  WUBR

  Creature — NephilimBRUW

  Yore-Tiller Nephilim puts Spawnsire of Ulamog onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Hooded Blightfang

  2B

  Creature — SnakeB

  Both cards trigger when a permanent attacks — they fire together.
• Loot Dispute

  3R

  EnchantmentR

  Both cards trigger when a permanent attacks — they fire together.
• Dyadrine, Synthesis Amalgam

  XGW

  Legendary Artifact Creature — ConstructGW

  Both cards trigger when a permanent attacks — they fire together.