Play with the top card of your library revealed.
You may play the top card of your library.
6/8/2016 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.
6/8/2016 You must follow the normal timing permissions and restrictions for the top card of your library and pay its costs. If it has alternative or additional costs, you may pay those. If the card has any mandatory additional costs, you must pay those.
6/8/2016 If the top card of your library is a land, you may play that land only if you have any available land plays.
6/8/2016 If the top card of your library changes while you’re casting a spell or activating an ability (perhaps because that top card is the card you’re casting) the new top card won’t be revealed until you finish casting that spell or activating that ability.
6/8/2016 As soon as you finish playing the card on top of your library, reveal the next card in your library.