4 official rulings from Bandai, last ruled Apr 4, 2025. Straight answers to how this card actually resolves.

If this card's <Your Turn> effect triggers, can I choose to not activate it?
No, you can't. If the effect triggers, it must activate.
Ruled Apr 4, 2025
Can I choose different Digimon for the Digimon that gains <Alliance> and the Digimon that attacks for this card's <Your Turn> effect?
Yes, you can.
Ruled Apr 4, 2025
After my Digimon gains <Alliance> with this card's <Your Turn> effect, can I choose to not attack for the part of the effect after "then"?
Yes, you can.
Ruled Apr 4, 2025
My Tamer has 4 colors. If this card's <On Play> <When Digivolving> effect activates, do I perform <De Digivolve 2>?
No. You perform <De Digivolve 1> twice, not <De Digivolve 2>. When performing <De Digivolve 2>, the top 2 cards are considered to be trashed at the same time, but when performing <De Digivolve 1> twice, the top 2 cards are trashed 1 at a time. For example, if using <De Digivolve 2> to simultaneously trash the top 2 cards of a suspended Digimon and the 2nd card trashed is BT15-047 [Kabuterimon], its effect won't activate. However, if performing <De Digivolve 1> twice and the Digimon becomes BT15-047 [Kabuterimon] after the 1st instance of <De Digivolve 1> trashes a card, it won't be affected by the 2nd instance of <De Digivolve 1> and won't be trashed.
Ruled Apr 4, 2025
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Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.