Confidence:StrongSolidPlausibleTentativeSpeculative

• Reanimate

  B

  SorceryB

  Reanimate puts Two-Headed Hellkite 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 Two-Headed Hellkite 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 Two-Headed Hellkite onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Animate Dead

  1B

  Enchantment — AuraB

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

  1B

  SorceryB

  Exhume puts Two-Headed Hellkite onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Life // Death

  G1B

  Sorcery // SorceryBG

  Life puts Two-Headed Hellkite 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 Two-Headed Hellkite onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Persist

  1B

  SorceryB

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

  BB

  SorceryB

  Soul Exchange puts Two-Headed Hellkite onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Rat King, Verminister

  1B

  Legendary Creature — Rat AvatarB

  Rat King, Verminister puts Two-Headed Hellkite 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 Two-Headed Hellkite 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 Two-Headed Hellkite'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 Two-Headed Hellkite 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.