Darkdramon

Q:Can I choose not to digivolve after returning cards with [D-Brigade] in their traits from my trash to the top of my deck for this card's "When you would digivolve into this card" effect?

A:No, you can't. The "When you would digivolve into this card" effect is an effect where you return cards with [D-Brigade] to the top of your deck and reduce the digivolution cost after you reveal this card from your hand and declare a digivolution. Once you return cards, you can't cancel the effect.