If the 3 cards revealed for this card's [On Play] effect include only either 1 card with the [Puppet] trait or 1 card with the [LIBERATOR] trait, can I just add that 1 card to my hand?
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Official Ruling
Yes, you can. Even if you only reveal one of the applicable cards, you can still add it to your hand.
Source: ST19-03 Shoemon