Your search for "gravitational shift 54" revealed the following:
Gravitational Shift (ROE) from Rise of the Eldrazi, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Svetlin Velinov Card Text:Creatures with flying get +2/+0.Creatures without flying get -2/-0.
Gravitational Shift (Foil) (ROE) from Rise of the Eldrazi, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Svetlin Velinov Card Text:Creatures with flying get +2/+0.Creatures without flying get -2/-0.
Gravitational Shift (SCD) from Starter Commander Decks, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Svetlin Velinov Card Text:Creatures with flying get +2/+0.Creatures without flying get -2/-0.