Undermountain Adventurer is a rare Creature — Giant Warrior card from Commander Legends: Battle for Baldur's Gate (CLB), collector number 594. Current market price: $0.37 (foil $1.26), 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.
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