Your search for "Selesnya Signet 257" revealed the following:
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.
Selesnya Signet (Foil) (RAV) from Ravnica: City of Guilds, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Greg Hildebrandt Card Text:1, T: Add GW to your mana pool.