My opponent has a Digimon with 5000 DP or less.Can I use this card's [When Digivolving] [When Attacking] effect and fulfill the "if this effect didn't delete" portion by not selecting a card to delete?
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No.If your opponent has a Digimon with 5000 DP or less, then you must select that card and delete it.
Source: EX13-013 WarGrowlmon