When this Digimon digivolves, can I intentionally choose not to use a 7-cost Option card in my hand to delete 1 of my opponent’s Digimon with 4000 DP or less?
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Official Ruling
Yes, you can choose not to use an Option card. If you don’t use one, you can delete 1 of your opponent’s Digimon with 4000 DP or less.
Source: BT6-017 MagnaKidmon