If this card's [Security] effect reveals a black Digimon card with a play cost of 4 or less from the top of my deck, can I add it to the hand without playing it?
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Official Ruling
Yes, you can. This effect reads "you may play it without paying the cost," therefore you may choose to not play it. In such cases, because the effect reads "add the remaining cards to your hand," you add the card to your hand.