Swashbuckler Extraordinaire is a uncommon Creature — Dragon Rogue Warrior card from Commander Legends: Battle for Baldur's Gate (CLB), collector number 198. Current market price: $0.35 (foil $0.52), TCGplayer market prices via Scryfall.
When this creature enters, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: 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.
All Commander Legends: Battle for Baldur's Gate cards and prices