1 official ruling from Bandai, last ruled Sep 6, 2024. Straight answers to how this card actually resolves.
I chose 1 opponent's Digimon with a play cost of 8 or less as the target for "can't attack players" in this card's <When Digivolving> effect. If that opponent's Digimon digivolves during their next turn and becomes a Digimon with a play cost of 9 or more, can it now attack players?
No, it can't. Even if a target Digimon of this card's <When Digivolving> effect becomes a level 9 or higher Digimon, it can't attack players.
Ruled Sep 6, 2024
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