After using this Digimon's effect to digivolve it into [AncientGreymon], I digivolve (or de-digivolve) it into another Digimon. Do I still have to delete it at the end of the turn?
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Official Ruling
Digimon carry over effects after digivolving or de-digivolving, so you still have to delete this Digimon at the end of the turn.