Eloise, Nephalia Sleuth

Mana cost: {3}{U}{B}
Type: Legendary Creature — Human Rogue
Power / toughness: 4 / 4
Set: Magic Online Promos #94052 (mythic)

Whenever another creature you control dies, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")
Whenever you sacrifice a token, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

Eloise, Nephalia Sleuth has 3 printings, first in Midnight Hunt Commander (2021). EDHREC ranks it #11,905 among Commander cards. It appears most in Inquisitor Greyfax decks (697 on EDHREC). 1 public deck on TCG runs it. It has 3 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 Eloise, Nephalia Sleuth

Undead Unleashed - Midnight Hunt Commander, led by Wilhelt, the Rotcleaver

Commanders that run Eloise, Nephalia Sleuth most

Deck counts from EDHREC.

Often played with Eloise, Nephalia Sleuth

Cards that show up in the same decks on EDHREC.

Rulings

2021-09-24: If you create a token that's a copy of Eloise and both are legendary, you will choose either the token or the original Eloise to keep and put the other into the graveyard. This is not the same as sacrificing it. Putting the token into the graveyard won't cause nontoken Eloise's last ability to trigger.
2021-09-24: If you sacrifice a Clue token, Eloise's last ability will trigger in response. You'll surveil before drawing the card.
2021-09-24: Eloise's last ability triggers whenever you sacrifice any token for any reason, not just whenever you sacrifice Clue tokens.