While you have 10 or more cards in your trash, your [Impmon] can digivolve into this card in your hand for a memory cost of 4, ignoring this card's digivolution requirements.
[When Digivolving] Delete 1 of your opponent's level 4 or lower Digimon.
Rulings Q&A — 2 entries
Q1Q1042
If I have 10 or more cards in my trash, can I digivolve one of my [Impmon] in the breeding area into this card?
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Official Ruling
No, you can't use this card's effect to digivolve from an [Impmon] in your breeding area.
If I have 10 or more cards in my trash, can I digivolve one of my [Impmon] in the battle area into this card in the hand when an effect to digivolve one of my Digimon is activated?