Yuan-Ti Fang-Blade is a common Creature — Snake Rogue card from Adventures in the Forgotten Realms (AFR), collector number 128. Current market price: $0.17 (foil $0.18), TCGplayer market prices via Scryfall.
Deathtouch Whenever this creature deals combat damage to a player, venture into the dungeon. (Enter the first room or advance to the next room.)