Does "If the total cards in both players' security stacks is 6 or less" mean 6 or less cards in either me or my opponent's security stacks?

No, it means if the total sum of cards in your security stack and the cards in your opponent's security stack is 6 or less.

If this card is revealed from my security stack and trashed by [BT10-086]/[Omnimon (X Antibody)]'s effect, does this card's “When this card is trashed from a security stack by an effect” effect activate?

No, it doesn't. A card revealed from your security stack and then trashed isn't considered "When this card is trashed from a security stack."

Richard Sampson rulings (BT13-098)

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

Effect: When an effect trashes this card from the security stack, you may play this card without paying the cost. [Start of Your Main Phase] If there're 6 or fewer total cards in both players' security stacks, gain 1 memory. [Main] If there're 6 or fewer total cards in both players' security stacks, by suspending this Tamer, 1 of your [Kudamon] may digivolve into [Kentaurosmon] in the hand for the digivolution cost, ignoring its level.
Security effect: [Security] Play this card without paying the cost.

Official Q&A

Does "If the total cards in both players' security stacks is 6 or less" mean 6 or less cards in either me or my opponent's security stacks?
No, it means if the total sum of cards in your security stack and the cards in your opponent's security stack is 6 or less.
Ruled Mar 28, 2024
If this card is revealed from my security stack and trashed by [BT10-086]/[Omnimon (X Antibody)]'s effect, does this card's “When this card is trashed from a security stack by an effect” effect activate?
No, it doesn't. A card revealed from your security stack and then trashed isn't considered "When this card is trashed from a security stack."
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.

Richard Sampson rulings (BT13-098)

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

Effect: When an effect trashes this card from the security stack, you may play this card without paying the cost. [Start of Your Main Phase] If there're 6 or fewer total cards in both players' security stacks, gain 1 memory. [Main] If there're 6 or fewer total cards in both players' security stacks, by suspending this Tamer, 1 of your [Kudamon] may digivolve into [Kentaurosmon] in the hand for the digivolution cost, ignoring its level.
Security effect: [Security] Play this card without paying the cost.

Official Q&A

Does "If the total cards in both players' security stacks is 6 or less" mean 6 or less cards in either me or my opponent's security stacks?
No, it means if the total sum of cards in your security stack and the cards in your opponent's security stack is 6 or less.
Ruled Mar 28, 2024
If this card is revealed from my security stack and trashed by [BT10-086]/[Omnimon (X Antibody)]'s effect, does this card's “When this card is trashed from a security stack by an effect” effect activate?
No, it doesn't. A card revealed from your security stack and then trashed isn't considered "When this card is trashed from a security stack."
Ruled Mar 28, 2024

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