MirageGaogamon (BT11-033) - Dimensional Phase Foil

[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.