Tap up to two target creatures.
Investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")
If Expose Evil has at least one target and all of those targets become illegal, the spell doesn’t resolve and you won’t investigate.
If you sacrifice a Clue for another card’s cost or effect, such as that of Angelic Purge or Tamiyo’s Journal, you can’t also pay {2} and sacrifice it to draw a card.
The token is named Clue and has the artifact subtype Clue. Clue isn’t a creature type.
The tokens are normal artifacts. For example, they can be sacrificed to cast Angelic Purge or targeted by Root Out.
You can cast Expose Evil with no targets if you only want to investigate.