Confidence:StrongSolidPlausibleTentativeSpeculative

• Helping Hand

  W

  SorceryW

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

  B

  SorceryB

  Unearth puts Seraphic Steed onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Geist of Saint Traft

  1WU

  Legendary Creature — Spirit ClericUW

  Both cards produce the same kind of effect (shared token subtype).
• Rampage of the Valkyries

  3WB

  EnchantmentBW

  Both cards produce the same kind of effect (shared token subtype).
• The Book of Exalted Deeds

  WWW

  Legendary Artifact — BookW

  Both cards produce the same kind of effect (shared token subtype).
• Angelic Favor

  3W

  InstantW

  Both cards produce the same kind of effect (shared token subtype).
• Invocation of Saint Traft

  1WU

  Enchantment — AuraUW

  Both cards produce the same kind of effect (shared token subtype).
• Jenson Carthalion, Druid Exile

  GW

  Legendary Creature — Human DruidBGRUW

  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.
• Court of Grace

  2WW

  EnchantmentW

  Both cards produce the same kind of effect (shared token subtype).
• 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.
• Descend upon the Sinful

  4WW

  SorceryW

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

  B

  SorceryB

  Reanimate puts Seraphic Steed 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.
• Serra the Benevolent

  2WW

  Legendary Planeswalker — SerraW

  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 Seraphic Steed 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.
• Isshin, Two Heavens as One

  RWB

  Legendary Creature — Human SamuraiBRW

  Isshin, Two Heavens as One makes Seraphic Steed's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.