Confidence:StrongSolidPlausibleTentativeSpeculative

• Reanimate

  B

  SorceryB

  Reanimate puts Arena Rector 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 Arena Rector onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Sefris of the Hidden Ways

  WUB

  Legendary Creature — Human WizardBUW

  Sefris of the Hidden Ways puts Arena Rector onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Recurring Nightmare

  2B

  EnchantmentB

  Recurring Nightmare puts Arena Rector 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 Arena Rector onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Animate Dead

  1B

  Enchantment — AuraB

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

  1B

  SorceryB

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

  G1B

  Sorcery // SorceryBG

  Life puts Arena Rector 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 Arena Rector onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Victimize

  2B

  SorceryB

  Victimize puts Arena Rector onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Persist

  1B

  SorceryB

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

  BB

  SorceryB

  Soul Exchange puts Arena Rector onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Ascent of the Worthy

  1WB

  Enchantment — SagaBW

  Ascent of the Worthy puts Arena Rector onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Necromancy

  2B

  EnchantmentB

  Necromancy puts Arena Rector onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Too Evil to Stay Dead

  2B

  SorceryB

  Too Evil to Stay Dead puts Arena Rector onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Vesperlark

  2W

  Creature — ElementalW

  Vesperlark puts Arena Rector onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Karai, Future of the Foot

  1WB

  Legendary Creature — Human NinjaBW

  Karai, Future of the Foot puts Arena Rector onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• One Last Job

  2W

  SorceryW

  One Last Job puts Arena Rector 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 Arena Rector onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• The Falcon, Airship Restored

  2B

  Legendary Artifact — VehicleB

  The Falcon, Airship Restored puts Arena Rector onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Reincarnation

  1GG

  InstantG

  Reincarnation puts Arena Rector onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Pulsemage Advocate

  2W

  Creature — Human ClericW

  Pulsemage Advocate puts Arena Rector onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Novablast Wurm

  3GGWW

  Creature — WurmGW

  Novablast Wurm wipes or mass-sacrifices creatures, and Arena Rector profits when creatures die — or comes back from the wipe itself.
• Grim Giganotosaurus

  5BG

  Creature — DinosaurBG

  Grim Giganotosaurus wipes or mass-sacrifices creatures, and Arena Rector profits when creatures die — or comes back from the wipe itself.
• Bolas's Citadel

  3BBB

  Legendary ArtifactB

  Bolas's Citadel is a sacrifice outlet, enabling Arena Rector's death or sacrifice trigger.