Fates' Reversal

Moving into a dungeon room will cause its room ability to trigger.

If you somehow venture into the dungeon while a room's ability is on the stack, you will continue on in the dungeon. If you're already in the last room, complete that dungeon and start a new one.

Dungeon cards are not part of a player's deck or sideboard. In both constructed and limited formats, players can use any dungeon card when they venture into the dungeon.

Choosing the dungeon or room to venture into is part of resolving the venture into the dungeon keyword action. Once that choice is made, players may not respond until after the appropriate room ability has triggered.

A player may only have one dungeon in the command zone at a time.

Once you resolve the last room ability of a dungeon, that dungeon is now completed and is removed from the game.