Lantern of Insight

• WWizards of the Coast2013-04-15
  Official Ruling
  If the top card of your library changes while you're casting a spell, playing a land, or activating an ability, the new top card won't be revealed until you finish doing so.
• WWizards of the Coast2013-04-15
  Official Ruling
  The top card of your library isn't in your hand, so you can't suspend it, cycle it, discard it, or activate any of its activated abilities.
• WWizards of the Coast2013-04-15
  Official Ruling
  When playing with the top card of your library revealed, if an effect tells you to draw several cards, reveal each one before you draw it.

Rulings via Scryfall