This card is in the battle area, and it has X Antibody in its digivolution cards. My opponent's Digimon with 4000 DP or less and a [When Attacking] effect attacks, and now it's suspended. At such times, this card's [All Turns] effect causes that Digimon's DP to become 0. Which is processed first, the deletion by a rule check or that Digimon's [When Attacking] effect?
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Official Ruling
The deletion by a rule check is processed first. As soon as your opponent's Digimon attacks and suspends, that Digimon's [When Attacking] effect triggers, but the rule check occurs before it activates. The Digimon with 0 DP will be deleted upon the rule check before the [When Attacking] effect can activate.
Source: BT16-101 Rapidmon (X Antibody)