5 official rulings from Bandai, last ruled Dec 13, 2024. Straight answers to how this card actually resolves.

Is "[Digivolve] While you have 2 or fewer security cards, [Gabumon]: Cost 3" a digivolution requirement added by an effect while I have 2 or fewer security cards?
No, this is a standard digivolution requirement for a Digimon card. It references the number of your security cards, but it's not an effect.
Ruled Dec 13, 2024
Can I use to digivolve my [Gabumon] into this card in the hand when I have 2 or fewer security cards and an opponent's Digimon attacks?
Yes, you can. Digivolution is possible as long as you have 2 or fewer security cards when you use .
Ruled Dec 13, 2024
If an opponent's Digimon attacks when I have 2 or fewer security cards, then an effect adds a card to my security stack so my security stack has 3 or more cards when I use , can my [Gabumon] digivolve into this card in the hand?
No, it can't. Digivolution from [Gabumon] isn't possible because the digivolution requirements aren't met when you use .
Ruled Dec 13, 2024
If an opponent's Digimon attacks when I have 3 security cards, then an effect removes a card from my security stack so my security stack has 2 or fewer cards when I use , can my [Gabumon] digivolve into this card in the hand?
Yes, you can. Digivolution from [Gabumon] is possible as long as the digivolution requirements are met when you use .
Ruled Dec 13, 2024
If I use an effect such as P-103 [Offense Training]'s <Delay> that digivolves a Digimon, can my [Gabumon] digivolve into this card in the hand when I have 2 or fewer security cards?
Yes, you can.
Ruled Dec 13, 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.