Dungeon Descent (AFR) from Adventures in the Forgotten Realms, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Kasia 'Kafis' Zielińska
• Card Text:
  Dungeon Descent enters the battlefield tapped.
  T: Add C.
  4, T, Tap an untapped legendary creature you control: Venture into the dungeon. Activate only as a sorcery. (Enter the first room or advance to the next room.)