If I don't trash 1 card in my hand, do I gain 1 memory from this card's [When Attacking] effect when [Eiji Nagasumi] is still in this Digimon's digivolution cards?
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Official Ruling
No, you don't gain 1 memory. The effect reads "By..." Therefore, the rest of the effect won't activate if you don't trash a card in your hand.
