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

What does "the total cards in both players' security stacks" in this card's effect mean?
It means the total number of cards in both you and your opponent's security stacks. For example, if you have 3 cards in your security stack and your opponent has 2 cards in their security stack, the total security cards will be 5 cards.
Ruled Mar 28, 2024
Can I choose to not use this card's <On Play><When Digivolving> effect to reveal 1 card from my hand if I don't have any yellow cards or I don't want to add cards to my security stack?
No, you can't. If the total cards in both players' security stacks is 6 or less, you must perform the rest of the effect to the best of your ability.
Ruled Mar 28, 2024
If I use this card's <On Play><When Digivolving> effect to reveal a 2-color yellow card from my hand, do I place it on top of my security stack or return it to my hand?
You place it on top of your security stack because the card's colors include yellow. You can't return it to your hand.
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.