Confidence:StrongSolidPlausibleTentativeSpeculative

• Reanimate

  B

  SorceryB

  Reanimate puts Elder Brain onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Grave Researcher // Reanimate

  2BB

  Creature — Troll Warlock // SorceryB

  Grave Researcher puts Elder Brain onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Obsessive Pursuit

  1B

  EnchantmentB

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

  G

  Creature — Goblin ShamanBGR

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

  G

  Creature — Human DruidGUW

  Both cards trigger when a permanent attacks — they fire together.
• 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.
• Clavileño, First of the Blessed

  1WB

  Legendary Creature — Vampire ClericBW

  Both cards trigger when a permanent attacks — they fire together.
• 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 Elder Brain onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Isshin, Two Heavens as One

  RWB

  Legendary Creature — Human SamuraiBRW

  Isshin, Two Heavens as One makes Elder Brain'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 Elder Brain 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.
• Banon, the Returners' Leader

  RW

  Legendary Creature — Human Cleric RebelRW

  Both cards trigger when a permanent attacks — they fire together.
• Director Nick Fury

  URW

  Legendary Creature — Human Spy HeroRUW

  Both cards trigger when a permanent attacks — they fire together.
• Sefris of the Hidden Ways

  WUB

  Legendary Creature — Human WizardBUW

  Sefris of the Hidden Ways puts Elder Brain onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Aloy, Savior of Meridian

  3GU

  Legendary Creature — Human WarriorGU

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

  2B

  EnchantmentB

  Recurring Nightmare puts Elder Brain onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Unfinished Business

  3WW

  SorceryW

  Unfinished Business puts Elder Brain onto the battlefield from a graveyard without casting it, so its mana cost is never paid.