I have a level 6 Digimon with a digivolution cost of 3, and use this card's effect to reduce that cost by 4, to -1. Can I digivolve into that Digimon by gaining a memory?
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Official Ruling
No, digivolution costs can't be reduced to less than zero. You can digivolve the card for free, but you can't gain memory with effects that reduce digivolution costs.
