"Unfortunately, all my test animals have died or escaped, so I shall be the final subject. I feel no fear. This is a momentous night." —Laboratory notes, final entry
2011-09-22
You may reveal the card even if it's not an instant or sorcery. Whether or not you reveal it, the card stays on top of your library.
2016-07-13
For more information on double-faced cards, see the Shadows over Innistrad mechanics article (http://magic.wizards.com/en/articles/archive/feature/shadows-over-innistrad-mechanics).