Undermountain Adventurer is a rare Creature — Giant Warrior card from Battle for Baldur's Gate Promos (PCLB), collector number 260s. Current market price: — (foil $2.76), TCGplayer market prices via Scryfall.
Vigilance When this creature enters, you take the initiative. {T}: Add {G}{G}. If you've completed a dungeon, add six {G} instead.