Is it possible to digivolve into [Beelzemon: Blast Mode] with this card's ＜When Digivolving＞ effect?

No, it is not. The card's effect allows digivolution only into a Digimon card whose name is [Beelzemon].

Impmon rulings (ST14-02)

2 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

Effect: [When Attacking] If you have 20 or more cards in your trash, this Digimon may digivolve into [Beelzemon] from your trash for a digivolution cost of 3, ignoring its digivolution requirements.
Inherited effect: [Your Turn] [Once Per Turn] When a card is trashed from your deck, delete 1 of your opponent's level 3 Digimon.

Official Q&A

Is it possible to digivolve into [Beelzemon: Blast Mode] with this card's ＜When Digivolving＞ effect?
No, it is not. The card's effect allows digivolution only into a Digimon card whose name is [Beelzemon].
Ruled Mar 28, 2024
I used this card's ＜When Attacking＞ effect to digivolve into [Beelzemon] from my trash. At such times, can I use my [EX2-065]/[Ai & Mako]'s effect to digivolve again into a [Beelzemon: Blast Mode] in my trash?
Yes, you can.
Ruled Mar 28, 2024

Combos using Impmon

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Impmon Warp into Beelzemon: Blast Mode

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