Midnight Pathlighter

Mana cost: {2}{W}{U}
Type: Creature — Human Wizard
Power / toughness: 2 / 3
Set: Forgotten Realms Commander #322 (rare)
Price: $3.09 USD

Creatures you control can't be blocked except by legendary creatures.
Whenever one or more creatures you control deal combat damage to a player, venture into the dungeon. (Enter the first room or advance to the next room.)

Midnight Pathlighter has 2 printings, first in Forgotten Realms Commander (2021). EDHREC ranks it #7,655 among Commander cards. It appears most in Sefris of the Hidden Ways decks (9,319 on EDHREC). 1 public deck on TCG runs it. It has 11 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: not legal
pioneer: not legal
standard: not legal
brawl: not legal

Public decks that run Midnight Pathlighter

Dungeons of Death - Forgotten Realms Commander, led by Sefris of the Hidden Ways

Commanders that run Midnight Pathlighter most

Deck counts from EDHREC.

Often played with Midnight Pathlighter

Cards that show up in the same decks on EDHREC.

Rulings

2021-07-23: 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.
2021-07-23: Dungeons are removed from the game as a state-based action.
2021-07-23: 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.
2021-07-23: 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.
2021-07-23: Moving into a dungeon room will cause its room ability to trigger.
2021-07-23: A player may only have one dungeon in the command zone at a time.
2021-07-23: Unblocked creatures with double strike deal damage twice, which will cause Midnight Pathlighter's last ability to trigger twice.
2021-07-23: You can only move forward (well, downward) in a dungeon, never backwards or sideways.
2021-07-23: The player venturing into the dungeon chooses which dungeon they will venture into. They may choose a dungeon that they have already completed this game.
2021-07-23: To venture into the dungeon, a player moves their venture marker into the next room of the dungeon they are currently in. If they aren't currently in a dungeon, that player instead chooses a dungeon card from outside the game, puts it into the command zone, and moves their venture marker onto the first room.
2021-07-23: Once you resolve the last room ability of a dungeon, that dungeon is now completed and is removed from the game.