This card's effects read "The Digimon played by this effect can't digivolve to level 7, and at the end of your opponent's turn, delete that Digimon." Do I delete that Digimon even if digivolution cards are added by an effect and then it becomes another Digimon due to an effect such as <De-Digivolve>?
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Official Ruling
Yes, it is still a Digimon that was played by this effect, so you delete it at the end of your opponent's turn.