Legion Angel

• WWizards of the Coast2020-09-25
  Official Ruling
  In a casual game, a card you choose from outside the game comes from your personal collection. In a tournament event, a card you choose from outside the game must come from your sideboard. You may look at your sideboard any time.
• WWizards of the Coast2020-09-25
  Official Ruling
  In a casual game, you may find a Legion Angel outside the game even if your deck contains already four copies of Legion Angel. In a Constructed tournament event, you can't have more than four copies of Legion Angel between your deck and sideboard.

Rulings via Scryfall