Your search for "Emerald Medallion 237" revealed the following:
Emerald Medallion (C14) from Commander 2014, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Daniel Ljunggren Card Text:Green spells you cast cost 1 less to cast.
Emerald Medallion - Borderless (MH3) from Modern Horizons 3, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Kim Dingwall Card Text:Green spells you cast cost 1 less to cast.
Emerald Medallion (CMM) from Commander Masters, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Daniel Ljunggren Card Text:Green spells you cast cost 1 less to cast.
Emerald Medallion (CMA) from Commander Anthology, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Daniel Ljunggren Card Text:Green spells you cast cost 1 less to cast.
Emerald Medallion (Etched) (CMM) from Commander Masters, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Daniel Ljunggren Card Text:Green spells you cast cost 1 less to cast.
Emerald Medallion (Foil) (CMM) from Commander Masters, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Daniel Ljunggren Card Text:Green spells you cast cost 1 less to cast.
Emerald Medallion (TMP) from Tempest, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Sue Ellen Brown Card Text:Your green spells cost 1 less to play.
Emerald Medallion - Borderless (Foil) (MH3) from Modern Horizons 3, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Kim Dingwall Card Text:Green spells you cast cost 1 less to cast.