Swashbuckler Extraordinaire (HBG-190) - Alchemy Horizons: Baldur's Gate

When Swashbuckler Extraordinaire enters, create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")
Whenever you attack, you may sacrifice one or more Treasures. When you do, up to that many target creatures gain double strike until end of turn.