Show and Tell | Magic: The Gathering
Formats Show and Tell is Legal in
Official Oracle Text for Show and Tell
Official Rulings for Show and Tell
10/4/2004 : Players choose cards during resolution, not announcement.
4/1/2008 : 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.