Caves of Chaos Adventurer is a rare Creature — Human Barbarian card from Battle for Baldur's Gate Promos (PCLB), collector number 167p. Current market price: $0.38 (foil $0.42), TCGplayer market prices via Scryfall.
Trample When this creature enters, you take the initiative. Whenever this creature attacks, exile the top card of your library. If you've completed a dungeon, you may play that card this turn without paying its mana cost. Otherwise, you may play that card this turn.