My opponent attacks with a Digimon and deletes my only blue Digimon with its [When Attacking] effect. I have no other blue Digimon in play, but can I still block the attack with this Digimon?
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Official Ruling
No. The [When Attacking] effect activates before reaction timing, which is when <Blocker> triggers. By the time reaction timing occurs, this Digimon no longer has <Blocker>, so it cannot block.
Source: ST9-07 KoKabuterimon