My opponent activated this card's [On Play] [When Digivolving] effect. If my Digimon without digivolution cards then gains digivolution cards by digivolving or other method, can it now attack?
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Official Ruling
Yes, it can now attack. This card's [On Play] [When Digivolving] effect targets "none of their Digimon with no digivolution cards," therefore Digimon that no longer meet the conditions can no longer be effect targets.
Source: LM-006 Cthyllamon