What does this card's "can't reduce digivolution costs" effect do, exactly?
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Official Ruling
It negates effects that read, "reduce the memory cost of the digivolution by X," like <Digisorption> and [BT3-103 Hidden Potential Discovered!].Even if your opponent activates effects like these, it won't reduce the memory cost of their digivolutions. They have to pay the digivolution cost on the card in order to digivolve.
