This card’s [All Turns] effect reads "This Digimon can't be deleted by your opponent's effects." How does this effect work, exactly?
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Official Ruling
This effect prevents deletion when this Digimon is the target of an effect with "delete" in its card text. Deletion will still occur if you lose a battle, both players lose a battle, or if this Digimon's DP is reduced to 0.
Source: BT14-062 Datamon