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Put target permanent on top of its owner's library.
Investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")
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’t cast a spell without choosing legal targets. If all of those targets become illegal, the spell doesn’t resolve and you won’t investigate.
