This card's <Digi-Burst> effect reads, "Delete 1 of your opponent's Digimon with a play cost of 6 or less. If no Digimon was deleted by this effect..." How does this effect work, exactly?
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Official Ruling
"If no Digimon was deleted by this effect" refers to times where, when <Digi-Burst> is activated, your opponent doesn't have a Digimon with a play cost of 6 or less in play, or an effect makes it so that there are no Digimon you can delete. Essentially, it means there was no Digimon in play that could be deleted by "Delete 1 of your opponent's Digimon with a play cost of 6 or less."