Your search for "Rakdos Signet 257" revealed the following:
Rakdos Signet (BRC) from The Brothers' War Commander, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Martina Pilcerova Card Text:1, T: Add BR.
Rakdos Signet (Foil) (DIS) from Dissension, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Greg Hildebrandt Card Text:1, T: Add BR to your mana pool.
Rakdos Signet (MM3) from Modern Masters 2017, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Martina Pilcerova Card Text:1, T: Add BR to your mana pool.
Rakdos Signet (Foil) (MM3) from Modern Masters 2017, available at 401 Games Canada. Rarity: Uncommon Finish: Foil Artist: Martina Pilcerova Card Text:1, T: Add BR to your mana pool.
Rakdos Signet (NCC) from New Capenna Commander, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Martina Pilcerova Card Text:1, T: Add BR.
Rakdos Signet - Dan Frazier is Back: Allied Signets (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Dan Frazier Card Text: Dan Frazier: Allied Signets1, T: Add BR.
Rakdos Signet - Dan Frazier is Back Secret Lair (Etched) (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Dan Frazier Card Text: Dan Frazier is Back: The Allied Signets1, T: Add BR.
Selesnya Signet (C13) from Commander 2013, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Raoul Vitale Card Text:1, T: Add GW to your mana pool.
Officer (007) // New Planet Token (Foil) (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Foil Artist: Nia Kovalevski & David Frasheski Card Text:New Planet: {T}: Add one mana of any color.
Officer (011) // New Planet Token (Foil) (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Foil Artist: Charles Chaisson & David Frasheski Card Text:New Planet: {T}: Add one mana of any color.
Officer (009) // New Planet Token (Foil) (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Foil Artist: Carlos Dattoli & David Frasheski Card Text:New Planet: {T}: Add one mana of any color.
Officer (013) // New Planet Token (Foil) (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Foil Artist: Gregg Schigiel & David Frasheski Card Text:New Planet: {T}: Add one mana of any color.
Officer (010) // New Planet Token (Foil) (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Foil Artist: Benjamin Ee & David Frasheski Card Text:New Planet: {T}: Add one mana of any color.
Officer (008) // New Planet Token (Foil) (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Foil Artist: Nathaniel Himawan & David Frasheski Card Text:New Planet: {T}: Add one mana of any color.
Officer (006) // New Planet Token (Foil) (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Foil Artist: Arthur Yuan & David Frasheski Card Text:New Planet: {T}: Add one mana of any color.
Rakdos Signet (CMD) from Commander 2011, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Greg Hildebrandt Card Text:1, T: add BR to your mana pool.
Rakdos Signet (DIS) from Dissension, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Greg Hildebrandt Card Text:1, T: Add BR to your mana pool.
Rakdos Signet (C17) from Commander 2017, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Martina Pilcerova Card Text:1, T: Add BR to your mana pool.
Rakdos Signet (CMA) from Commander Anthology, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Greg Hildebrandt Card Text:1, T: Add BR to your mana pool.
Rakdos Signet (CLU) from Ravnica: Clue Edition, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Martina Pilcerova Card Text:1, T: Add BR.
Rakdos Signet (GK2) from RNA Guild Kit, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Martina Pilcerova Card Text:1, T: Add BR.