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

I use this card, but my opponent has no Digimon without digivolution cards in play, so I can't specify any Digimon that can't attack or block. If my opponent later plays a Digimon without digivolution cards to their battle area, can I make that Digimon unable to attack or block?
No, you can't. You can only specify Digimon that can't attack or block at the time this card’s effect is activated.
Ruled Mar 28, 2024
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