Wandering Troubadour is a uncommon Creature — Dragon Bard card from Adventures in the Forgotten Realms (AFR), collector number 210. Current market price: $0.21 (foil $0.17), TCGplayer market prices via Scryfall.
At the beginning of your end step, if you had a land enter the battlefield under your control this turn, venture into the dungeon. (Enter the first room or advance to the next room.)