Does this card's "cards can't be added to security stacks by your opponent's effects" mean that effects that add cards to security stacks on "your opponent's Digimon with play costs of 7 or less" can't be activated?
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Official Ruling
No. Cards can't be added to security stacks by your opponent's effects regardless of the card type or level (the effects will activate, but cards still can't be added to security stacks). The "your opponent's Digimon with play costs of 7 or less" refers to the "can't attack players" effect.
