Revealing a card in Harry Potter Hogwart's Battle
From what I understand, it just goes back on the top of your deck and you'll just know at least one of the cards you get on your next turn.

From boardgamegeek


  Musketeer84 wrote:
  
  If you don't need to discard a card, would the card sit at the top of the deck or move into your hand for the start of next turn?
  
  The standard interpretation of "reveal" in most deck games is that the card stays in its location, in this case on the top of your deck, unless an instruction says otherwise. The only purpose of a reveal is to make a hidden card public knowledge.