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

Does this card's When Attacking effect activate when I have a Tamer that isn't blue in play?
Yes, it does. This card's When Attacking effect doesn't depend upon the color of your Tamers.
Ruled Mar 28, 2024
I have 2 blue Tamers in play. During my turn, does this card's inherited effect grant +2000 DP?
No. No matter how many blue Tamers you have in play, the effect only grants +1000 DP.
Ruled Mar 28, 2024
After unsuspending itself with its <When Attacking> <Once> effect, I digivolve into a new Digimon and attack with it. The security check reveals a card that <De Digivolve 1> it back into [BT1-115]/[Veedramon]. Can I use the <Once> effect of Veedramon again?
No, you cannot because it was already used. <Once> effects are per card.
After unsuspending itself with its <When Attacking> <Once> effect, it got <De Digivolve 1> into a level 3. I evolve it back into [BT1-115]/[Veedramon]. Can I use its effect?
Yes, you can use the <Once> effect of the new [BT1-115]/[Veedramon] again. <Once> effects are per card.
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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.