Your search for "Reflecting Pool 257" revealed the following:
Reflecting Pool (Foil) (MB2) from Mystery Booster 2, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Fred Fields Card Text:T: Add one mana of any type that a land you control could produce.
Reflecting Pool - Fallout: Points of Interest (Rainbow Foil) (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: AKQA Card Text: Fallout: Points of InterestT: Add one mana of any type that a land...
Reflecting Pool - Borderless (Galaxy Foil) (EOS) from Edge of Eternities: Stellar Sights, available at 401 Games Canada. Rarity: Mythic Rare Finish: Foil Artist: Craig Elliott Card Text:T: Add one mana of any type that a land you control could...