What does "isn't affected by [...] effects" mean, exactly?
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Official Ruling
This effect prevents Digimon from being affected by effects. For example, your Digmon won't suspend if it's chosen for a "suspend 1 of your opponent's Digimon" effect, and its DP won't be reduced if it's chosen for a "1 of your opponent's Digimon gets -3000 DP" effect.