If my opponent's Digimon attacks a player and this card is trashed from the security stack by a [When Attacking] effect, which comes first, the security check from the attack or this card's “When this card is trashed from a security stack by an effect” effect?
This card's effect activates before the security check.
Mar. 28, 2024
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.
Mar. 28, 2024
My opponent's Digimon attacks a player and this card is trashed from the security stack by a [When Attacking] effect. If this card's [Main] effect gives all of my opponent's Digimon and the attacking Digimon now has a security check number of 0, is a security check performed?
No, the Digimon's security check is zero. No checks are performed.
Mar. 28, 2024
Does this card's [Main] effect activate if this card is trashed from the security stack when my opponent has activated a "your opponent doesn't activate [Security] effects" effect?
Yes. It activates because "When this card is trashed from a security stack by an effect" isn't a [Security] effect.
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."
Mar. 28, 2024