Can I pay just 1 cost for this card's [Main] effect?
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Official Ruling
No, you can't. A "by" condition can't be met if only some of the required actions are performed. The conditions for this [Main] effect require you to pay 3 cost.
My opponent has a level 5 or lower Digimon. Can I meet the "if this effect didn't delete" condition in this card's [Main] effect by not choosing a card to delete?
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Official Ruling
No, you can't. If your opponent has a level 5 or lower Digimon, you must choose that card and delete it.
My opponent has a level 5 or lower Digimon. Can I meet the "if this effect didn't delete" condition in this card's [Main] effect by choosing an opponent's level 5 or lower Digimon with an effect that prevents deletion?