You don’t have to reveal the card in your hand that’s leaving the game.
12-11-2019
wotc
If you have no cards in hand, you can’t put the white card you reveal into your hand.
12-11-2019
wotc
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 at any time.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.