Effect
Reveal your hand, choose 1 card, and shuffle it into the Deck.
This effect does not target.
If you have 0 cards in your hand, you cannot activate "The Humble Sentry".
The player who activated "The Humble Sentry" chooses the card to return to the Deck with the effect of "The Humble Sentry". (It is not the opponent.)
You can choose a card that was added to your hand by the effect of "Exchange" and whose original owner is your opponent as the card to return to the Deck with the effect of "The Humble Sentry". (In that case, the card is returned to the opponent's Deck, who is the original owner, to complete the process.)
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