Your search for "Assassinate 139" revealed the following:
Akali - Rogue Assassin - 139/166 - Rare from Riftbound: Vendetta, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Envar Studio Card Text:[EMPOWER 3 and 1 Rune] (3 and 1 Rune: Empower this. Use only if not Empowered.)[ACTION]...
Assassinate (Foil) (BBD) from Battlebond, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Kev Walker Card Text:Destroy target tapped creature.
Assassinate (BBD) from Battlebond, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Kev Walker Card Text:Destroy target tapped creature.
Starting with The Brothers' War, Buy-a-Box Promos will only be available for in-store pick-ups and purchase while supplies last as stated in Wizards of the Coast's article here. Does Not Contain Any Promotional Material
Star Piece - 139/144 - Uncommon - Reverse Holo from Skyridge, available at 401 Games Canada. Rarity: Uncommon Finish: Reverse Holo Artist: Jungo Suzuki Card Text:Attach Star Piece to 1 of your Pokémon that doesn't already have a Pokémon Tool...
Conspiracy - Extended Art (ACR) from Assassin's Creed, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Allen Morris Card Text:As Conspiracy enters the battlefield, choose a creature type.Creatures you control are the chosen type. The same is true...
Waterlogged Grove - Borderless (ACR) from Assassin's Creed, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Alexander Gering Card Text:T, Pay 1 life: Add G or U.1, T, Sacrifice Waterlogged Grove: Draw a card.