Originally Posted by crunc
One case where it really is an outright cheat (in Ascension iOS), incidentally, is the card in RotF where you guess what the next card on your deck is.
Theoretically, you could have memorized what cards are where, as that is all known information. What's good about the way that Ascension does it is that it displays the cards in a sorted order, that does not match the order of the cards in the desk (or discard or void piles)
Again, even though you couldn't randomly pick up the decks and leaf though them, the game should let you look at things you could have kept track of, at the very least a 'log' like what Ascension lets you track back through, especially in async games for the reasons people keep mentioning.