Confidence:StrongSolidPlausibleTentativeSpeculative

• Reanimate

  B

  SorceryB

  Reanimate puts Rust Scarab 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 Rust Scarab 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 Rust Scarab onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Laccolith Rig

  R

  Enchantment — AuraR

  Both cards trigger when a permanent blocks — they fire together.
• Animate Dead

  1B

  Enchantment — AuraB

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

  1B

  SorceryB

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

  G1B

  Sorcery // SorceryBG

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

  1B

  SorceryB

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

  BB

  SorceryB

  Soul Exchange puts Rust Scarab onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Powerstone Minefield

  2RW

  EnchantmentRW

  Both cards trigger when a permanent blocks — they fire together.
• Trailblazer's Torch

  4

  Artifact — EquipmentC

  Both cards trigger when a permanent blocks — they fire together.
• Roaming Throne

  4

  Artifact Creature — GolemC

  Roaming Throne makes Rust Scarab's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Mirror Room // Fractured Realm

  2U5UU

  Enchantment — Room // Enchantment — RoomU

  Mirror Room makes Rust Scarab's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Rat King, Verminister

  1B

  Legendary Creature — Rat AvatarB

  Rat King, Verminister puts Rust Scarab onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Wizard's Staff

  1U

  Artifact — EquipmentU

  Wizard's Staff makes Rust Scarab's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Hezrou // Demonic Stench

  5BBB

  Creature — Frog Demon // Instant — AdventureB

  Both cards trigger when a permanent blocks — they fire together.
• Luminous Wake

  2W

  Enchantment — AuraW

  Both cards trigger when a permanent blocks — they fire together.
• Extraction Integrant

  1B

  Artifact Creature — BorgB

  Both cards trigger when a permanent blocks — they fire together.
• Close Quarters

  2RR

  EnchantmentR

  Both cards trigger when a permanent blocks — they fire together.
• Infiltration Lens

  1

  Artifact — EquipmentC

  Both cards trigger when a permanent blocks — they fire together.
• Yore-Tiller Nephilim

  WUBR

  Creature — NephilimBRUW

  Yore-Tiller Nephilim puts Rust Scarab onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Labyrinth Raptor

  BR

  Creature — Nightmare DinosaurBR

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

  WUB

  Legendary Creature — Human WizardBUW

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

  2B

  EnchantmentB

  Recurring Nightmare puts Rust Scarab onto the battlefield from a graveyard without casting it, so its mana cost is never paid.