Show and Tell

• WWizards of the Coast2004-10-04
  Official Ruling
  If the cards being put onto the battlefield also require choices, those choices are made after all players choose their card. The active player makes choices for their card (if any), then the other players (if any) in turn order.
• WWizards of the Coast2004-10-04
  Official Ruling
  Players choose cards during resolution, not announcement.
• WWizards of the Coast2008-04-01
  Official Ruling
  The current player chooses first, then each other player chooses in turn order. A player does not have to reveal the chosen card, so long as it is clear *which* card was chosen. After all choices are made, the cards are put onto the battlefield simultaneously.

Rulings via Scryfall

• WO
  Wizards of the Coast2024-02-05

  Show and Tell was banned in historic on February 5, 2024. With all of the additions to Historic with Murders at Karlov Manor, there was one card we felt was a little too powerful right out of the gate. Source: https://magic.wizards.com/en/news/mtg-arena/mtg-arena-announcements-february-5-2024