Can I return just 1 of the specified cards to the bottom of the deck for the conditions of this card's [Opponent's Turn] effect?
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Official Ruling
No, you can't. A "by" condition can't be met if only some of the required actions are performed. The conditions for this [Opponent's Turn] effect require you to return the specified number of cards to the bottom of the deck.
Source: P-089 Amphimon