If an effect causes a player to play with the top card of their library revealed, and that particular card stops being revealed for any length of time before being revealed again, it becomes a new object.
April 8, 2016 · Shadows over Innistrad
If an effect causes a player to play with the top card of his or her library revealed, and that particular card stops being revealed for any length of time before being revealed again, it becomes a new object.
July 17, 2015 · Magic Origins
Some effects tell a player to play with the top card of his or her library revealed, or say that a player may look at the top card of his or her library. If the top card of the player’s library changes while a spell is being cast, the new top card won’t be revealed and can’t be looked at until the spell becomes cast (see rule 601.2i). The same is true with relation to an ability being activated.
February 1, 2014 · Born of the Gods
Some effects tell a player to play with the top card of his or her library revealed, or say that a player may look at the top card of his or her library. If the top card of the player’s library changes while a spell is being cast, the new top card won’t be revealed and can’t be looked at until the spell becomes cast (see rule 601.2h). The same is true with relation to an ability being activated.
September 30, 2011 · Innistrad
Some effects tell a player to play with the top card of his or her library revealed, or say that a player may look at the top card of his or her library. If the top card of the player's library changes while a spell is being cast, the new top card won't be revealed and can't be looked at until the spell becomes cast (see rule 601.2h). The same is true with relation to an ability being activated.
June 17, 2011 · Commander 2011
Some effects tell a player to play with the top card of his or her library revealed, or say that a
April 1, 2011 · Duel Decks: Knights vs. Dragons
Some effects tell a player to play with the top card of his or her library revealed, or say that a player may look at the top card of his or her library. If the top card of the player's library changes while a spell is being cast, the new top card won't be revealed and can't be looked at until the spell becomes cast (see rule 601.2h). The same is true with relation to an ability being activated.
February 4, 2011 · Mirrodin Besieged
Some effects tell a player to play with the top card of his or her library revealed, or say that a player may look at the top card of his or her library. If the top card of the player’s library changes while a spell is being cast, the new top card won’t be revealed and can’t be looked at until the spell becomes cast (see rule 601.2h). The same is true with relation to an ability being activated.
October 1, 2010 · Scars of Mirrodin
Some effects tell a player to play with the top card of his or her library revealed, or say that a
February 1, 2010 · Worldwake
Some effects tell a player to play with the top card of his or her library revealed, or say that a player may look at the top card of his or her library. If the top card of the player's library changes while a spell is being cast, the new top card won't be revealed and can't be looked at until the spell becomes cast (see rule 601.2h). The same is true with relation to an ability being activated.