If I choose an opponent's Digimon for this card's [When Digivolving] effect, and that Digimon loses <Blocker> due to digivolving, <De-Digivolve>, or some other reason, can that Digimon now attack and block again?
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Official Ruling
No. Once a Digimon with <Blocker> is targeted by this card's [When Digivolving] effect, it becomes unable to attack or block until the end of your opponent’s next turn, even if it loses <Blocker>.