[Digivolve] 2 from [BlackWarGreymon]
<Reboot>
[Opponent's Turn][Once Per Turn] When your opponent's Digimon with the highest DP attacks, you may switch the target of attack to this Digimon.
[Opponent's Turn][Once Per Turn] When a Digimon becomes unsuspended, if this Digimon has [BlackWarGreymon] or [X Antibody] in its digivolution cards, you may delete 1 of your opponent's Digimon with the lowest play cost.
Rulings Q&A — 2 entries
Q1Q2102
An opponent's Digimon without the highest DP attacks, and by using a [When Attacking] effect to increase its DP, it becomes the Digimon with the highest DP. In such cases, can the target of the attack be switched to this Digimon with this card's [Opponent's Turn] effect?
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Official Ruling
No, you can't. If Digimon did not have the highest DP when the attack was declared, this card's [Opponent's Turn] effect can't be activated.