Burning Inquiry

• WWizards of the Coast2009-10-01
  Official Ruling
  First the player whose turn it is draws three cards, then each other player in turn order does so. Then the active player randomly chooses the three cards they will discard, then each other player in turn order does so. Then all the cards are discarded at the same time.
• WWizards of the Coast2009-10-01
  Official Ruling
  Each player must discard three cards, even a player that (for some reason) didn’t actually draw three cards.

Rulings via Scryfall