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

If I activate this card's <When Digivolving> effect and use an Option card while my opponent has activated [BT9-103]/[Kongou]'s effect, what happens when that Option card's effect has finished activating?
[BT9-103]/[Kongou]'s effect prevents cards from being added to your security stack, so the card is placed in your trash.
Ruled Mar 28, 2024
What happens if I activate this card's <When Digivolving> effect to use an Option card that has a "Then, place this card in your battle area" effect?
You place this card in your battle area. You can't trash it due to the Option card's own effect, so "Place the Option card used with this effect on top of your security stack face down instead of placing it in your trash" doesn't activate.
Ruled Mar 28, 2024
I activate this card's <When Digivolving> effect to use [BT4-105]/[Tactical Retreat!] and choose this card itself as the target, so I place this card on top of my security stack face down. Does this card's effect still place [BT4-105]/[Tactical Retreat!] on top of my security stack after it has finished activating, even though this card has now been removed from the battle area?
Yes, the effect of this card has already activated, so you still place [BT4-105]/[Tactical Retreat!] on top of your security stack.
Ruled Mar 28, 2024
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