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

How does this card's <Opp Turn> effect work, exactly?
This effect gives <Security Attack -2> to all of your opponent's Digimon with levels greater than or equal to the total cards in both players' security stacks. For example, if the total cards in both players' security stacks is 6, then all of your opponent's level 6 and higher Digimon will get <Security Attack -2>.
Ruled Mar 28, 2024
What does "total cards in both players' security stacks" in this card's <Opp Turn> 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
If the number of security cards decreases, does the level for the targets for <Security Attack -2> in this card's <Opp Turn> effect also decrease at that time?
Yes, that's correct.
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.