2 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

When using this card’s effect to place a card on top of my security stack, do I need to show it to my opponent?
Yes. You're revealing cards from your deck, which means they’re public information until you choose one to place face down on top of your security stack. You must show the card you place in your security stack to your opponent first.
Ruled Mar 28, 2024
Can I use this card if I have 1 or fewer cards left in my deck?
Yes, you can. Reveal as many cards from your deck as you can, then perform the rest of the effect as normal.
Ruled Mar 28, 2024
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Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.