My opponent has a Digimon. Can I meet the "if this effect didn't delete" condition in this card's [On Play] [When Attacking] [On Deletion] effect by not choosing a card to delete?
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Official Ruling
No, you can't. If your opponent has Digimon, you must choose the card with the lowest play cost among them and delete it.
Source: BT25-076 Ghoulmon