When a Digimon with [Dracomon] or [Examon] in its text is played, this card's [Your Turn] effect and that Digimon's [On Play] effect trigger simultaneously.This card's [Your Turn] effect is activated first to digivolve this card.At this time, in what order do I activate the digivolved card's [When Digivolving] effect and the played card's [On Play] effect?
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The [When Digivolving] effect is activated first.When your Digimon was played, the [On Play] effect and the [Your Turn] effect triggered simultaneously.Activating this card's [Your Turn] effect to digivolve the Digimon caused its [When Digivolving] effect to newly trigger, so it is activated first according to the derived triggering rule.
Source: EX13-018 Coredramon