A Digimon's DP became 0 from this card's [On Play] [When Digivolving] effect. At such times, is that Digimon deleted before the rest of this effect's processing is resolved?
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No, it isn't deleted yet. Once all of the processing for this card's [On Play] [When Digivolving] effect is resolved, then all of the Digimon with 0 DP are deleted at the same time.
Source: BT23-050 Ankylomon