Rulings

• If the targeted permanent or player is an illegal target by the time Explosive Revelation resolves, the spell doesn’t resolve. You won’t reveal any cards from your library.2010-06-15
• Once you start revealing cards from your library, it’s too late for players to respond. If you target a creature, for example, its controller can’t wait to see how much damage will be dealt to it before casting a damage prevention spell, activating a regeneration ability, sacrificing it for some benefit, or anything else. Any such actions must be done before Explosive Revelation starts to resolve.2010-06-15
• If all the cards in your library are land cards, you’ll reveal all of them, then arrange them in your library in whatever order you like. No damage is dealt.2010-06-15