After using this card, I digivolve a red Digimon into a white Digimon card. What color card can I trash from my hand to reduce the memory cost of the digivolution?
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Official Ruling
You can trash a red Digimon card to reduce the digivolution cost. The card you can trash with this effect must match the color of the Digimon performing the digivolution in your battle area.
Source: EX1-071 Win Rate: 60%!