As an aside, you need to look at the errata for library. Library of Leng

Artifact
5E
You have no maximum hand size.
If an effect causes you to discard a card, discard it, but you may put it on...
Type: Posts; User: Beatusnox
As an aside, you need to look at the errata for library. Library of Leng

Artifact
5E
You have no maximum hand size.
If an effect causes you to discard a card, discard it, but you may put it on...
Just because you want the rule that answers your question to be incorrect does not make it so.
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Just because common short cutting or procedure places your hand down to choose something at random does not make it so.
It seems like you're being intentionally obtuse here.
You look at a...
The card is chosen at random, you will see what card is chosen....
402.3: A player may arrange his or her hand in any convenient fashion and look at it as much as he or she wishes. A player can't...
Wait.... you're asking if a card that is looked at, at random is known to both players? Yes. You have the right to see your hand at all times, when they look at a card at random, you see what card...