Inquisitor Eisenhorn

• WOTC Official Reminder Textofficial rules
  Investigate — Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card."

• WWizards of the Coast2022-10-07
  Official Ruling
  It's important to reveal the first card you draw each turn (or choose not to reveal it) before it is mixed with the other cards in your hand. You look at the card as you draw it before choosing whether to reveal it.
• WWizards of the Coast2022-10-07
  Official Ruling
  If the card leaves your hand before Inquisitor Eisenhorn's triggered ability resolves, you'll still create a Cherubael token.
• WWizards of the Coast2022-10-07
  Official Ruling
  You don't have to reveal a drawn card if you don't wish to create a Cherubael token.
• WWizards of the Coast2022-10-07
  Official Ruling
  Multiple card draws are always treated as a sequence of individual card draws. For example, if you haven't drawn any cards yet during a turn and cast a spell that instructs you to draw three cards, you'll draw them one at a time. Only the first card drawn this way may be revealed with Inquisitor Eisenhorn's ability.
• WWizards of the Coast2022-10-07
  Official Ruling
  If you reveal a card this way, it remains revealed until Inquisitor Eisenhorn's triggered ability finishes resolving.
• WWizards of the Coast2022-10-07
  Official Ruling
  You can reveal an instant or sorcery card this way on any turn to create a token, not just your own, if it's the first card you've drawn that turn.
• WWizards of the Coast2022-10-07
  Official Ruling
  If an effect puts a card into your hand without using the word "draw," the card wasn't drawn.

Rulings via Scryfall