So, I just had an idea for a card
Password
5D Action-Reserve
Put this on your tavern mat.
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When you would shuffle your deck, you may trash this from your tavern mat to instead look through and arrange your deck in any order you choose.
(The original version didn't trash itself, but I figured that would be wayyy too strong.)
The problem with the card, I think, would be that it would take FAR too long to resolve. It would be both pretty irritating for the person who used it and the other player. So, I need to find a way to retain the idea of the card, but also fix the time issue. Thoughts?