Confidence:StrongSolidPlausibleTentativeSpeculative

• Priest of Fell Rites

  WB

  Creature — Human WarlockBW

  Priest of Fell Rites puts Bygone Colossus onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Animate Dead

  1B

  Enchantment — AuraB

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

  1B

  SorceryB

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

  G1B

  Sorcery // SorceryBG

  Life puts Bygone Colossus 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 Bygone Colossus onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Persist

  1B

  SorceryB

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

  BB

  SorceryB

  Soul Exchange puts Bygone Colossus 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 Bygone Colossus onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Song of Creation

  1GUR

  EnchantmentGRU

  Bygone Colossus lets you cast/play from exile, enabling Song of Creation's exile-recursion loop.
• God-Eternal Oketra

  3WW

  Legendary Creature — Zombie GodW

  Bygone Colossus lets you cast/play from exile, enabling God-Eternal Oketra's exile-recursion loop.
• Sheoldred, Whispering One

  5BB

  Legendary Creature — Phyrexian PraetorB

  Sheoldred, Whispering One puts Bygone Colossus onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Shanid, Sleepers' Scourge

  1RWB

  Legendary Creature — Human KnightBRW

  Bygone Colossus lets you cast/play from exile, enabling Shanid, Sleepers' Scourge's exile-recursion loop.
• Quintorius Kand

  3RW

  Legendary Planeswalker — QuintoriusRW

  Bygone Colossus lets you cast/play from exile, enabling Quintorius Kand's exile-recursion loop.
• The Circle of Loyalty

  4WW

  Legendary ArtifactW

  Bygone Colossus lets you cast/play from exile, enabling The Circle of Loyalty's exile-recursion loop.
• Jodah, the Unifier

  WUBRG

  Legendary Creature — Human WizardBGRUW

  Bygone Colossus lets you cast/play from exile, enabling Jodah, the Unifier's exile-recursion loop.
• Virtue of Persistence // Locthwain Scorn

  5BB1B

  Enchantment // Sorcery — AdventureB

  Virtue of Persistence puts Bygone Colossus onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Primeval Bounty

  5G

  EnchantmentG

  Bygone Colossus lets you cast/play from exile, enabling Primeval Bounty's exile-recursion loop.
• Reanimate

  B

  SorceryB

  Reanimate puts Bygone Colossus onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Captain Jean-Luc Picard

  2W

  Legendary Creature — Human OfficerW

  Bygone Colossus lets you cast/play from exile, enabling Captain Jean-Luc Picard's exile-recursion loop.
• Kasla, the Broken Halo

  3URW

  Legendary Creature — Angel AllyRUW

  Bygone Colossus lets you cast/play from exile, enabling Kasla, the Broken Halo's exile-recursion loop.
• Lavinia, Foil to Conspiracy

  1W/UW/U

  Legendary Creature — Human DetectiveUW

  Bygone Colossus lets you cast/play from exile, enabling Lavinia, Foil to Conspiracy's exile-recursion loop.
• Grave Researcher // Reanimate

  2BB

  Creature — Troll Warlock // SorceryB

  Grave Researcher puts Bygone Colossus onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Liliana, Death's Majesty

  3BB

  Legendary Planeswalker — LilianaB

  Liliana, Death's Majesty puts Bygone Colossus onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Fire Lord Zuko

  RWB

  Legendary Creature — Human Noble AllyBRW

  Bygone Colossus lets you cast/play from exile, enabling Fire Lord Zuko's exile-recursion loop.
• Quest for the Holy Relic

  W

  EnchantmentW

  Bygone Colossus lets you cast/play from exile, enabling Quest for the Holy Relic's exile-recursion loop.