Anthony has Courser of Kruphix on the field. He begins resolving Dig Through Time.
While Dig Through Time is resolving, must the top card be kept separate from the other six?
I'm thinking that Anthony's opponent should know what happens to the top card because it is revealed. What I don't understand is how a judge could enforce this. Anthony could easily shuffle the cards around in his hand before choosing two of them (and in practice, most people who I've seen cast Dig Through Time do mix up the cards before finally settling on two of them).
What I think the rules allow for (emphasis on the part I made up):
Anthony leaves the top card revealed and separate while browsing through the other six, which remain hidden. He chooses two out of the seven and puts them into his hand. If Anthony chooses the top card, his opponent will know because it was kept revealed and separate.
I'm playing this deck at an invitational in two weeks and I need to know how to do this properly so that I can give the least amount of information to my opponents while not cheating.