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

If one of my Digimon digivolves after I use this card, does that Digimon still receive this card's effect?
Yes, it does.
Ruled Mar 28, 2024
After activating this card's effect, I use [BT1-089]/[Mimi Tachikawa]'s effect to move a Digimon from my breeding area to my battle area. Does this card's effect also apply to that Digimon?
Yes, it does.
Ruled Mar 28, 2024
I attack an opponent's Digimon with a Digimon that's gained the When Attacking effect from this card. The When Attacking effect reduces my opponent's Digimon to 0 DP, deleting it. What happens next?
No battle occurs, and the attack ends. If there are other When Attacking effects, "when one of your Digimon attacks" effects, and/or effects activated at counter timing, they activate, and then the attack ends. If it's then blocked at blocker timing, start a battle with the blocking Digimon.
Ruled Mar 28, 2024
I play this card, then play a Digimon. Does it receive this card's effect?
Yes, it does.
Ruled Mar 28, 2024
I use 2 copies of this card. When I attack with a Digimon, can I activate its When Attacking effect twice in a single attack, giving an opponent's Digimon -4000 DP?
Yes, you can.
Ruled Mar 28, 2024
I have activated [BT1-104]/[Golden Ripper] and attack with [BT3-058]/[BanchoStingmon]. If I use this card's effect to decrease the attack of the attack target from 12000 DP to 10000 DP before I use BanchoStingmon's effect, can I give it +7000 DP?
Yes, you can still use BanchoStingmon's effect if the attack target's DP decreases before BanchoStingmon's effect activates as long as it was 12000 DP when it was targeted for the attack.
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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.