[When Digivolving] Return 1 of your opponent's level 5 or lower Digimon to its owner's hand. If no Digimon was returned by this effect, your opponent adds the top card of their security stack to their hand.
[All Turns][Once Per Turn] When an effect adds cards to your opponent's hand, gain 1 memory for every 4 cards in your opponent's hand.
Rulings Q&A — 1 entries
Q1Q2070
Can the [Security] effect of the card added to the hand with this card's "your opponent adds the top card of their security stack to their hand" effect be activated?
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Official Ruling
No, since the card was not revealed by a security check, its [Security] effect can't be activated.