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

Can I choose an opponent's Digimon with a "can't attack" effect as the target when I activate this card's <Main Timing> effect?
Yes, you can. However, in such cases the "can't attack" effect prevents making the attack.
Ruled Jun 28, 2024
What happens if this card's <Main Timing> effect activates twice and 2 of my opponent's Digimon gain the "<Start Your Main> This Digimon attacks" effect?
At the start of your opponent's main phase, the effects gained from this card's effect are triggered at the same time, and your opponent determines which one activates first. After effects such as <When Attacking> have activated, and before the counter timing occurs, it is time to activate the effect of the 2nd Digimon that was pending activation. However, since the 1st Digimon is already attacking, the effect ends without an attack made. As a result, only the Digimon whose effect was activated first can attack.
Ruled Jun 28, 2024
What happens if this card's <Main Timing> effect is activated on an opponent's Digimon with an "<Opp Turn> This Digimon isn't affected by your opponent’s effects" effect?
A Digimon with a "this Digimon isn't affected by your opponent’s effects" effect can also be chosen as a target for this effect, therefore your opponent's Digimon will lose the "this Digimon isn't affected by your opponent’s effects" effect as soon as it becomes your opponent's turn, then it will be affected by this card's effect. As a result, the attack occurs at the start of the main phase.
Ruled Jun 28, 2024
Can I trash this card itself from digivolution cards for this card's inherited effect?
Yes, that's correct.
Ruled Jun 28, 2024
Can I use this card's <Main Timing> effect to pay 2 cost even when I don't have any [Legend-Arms] or level 5 Digimon?
No, you can't. The activation conditions include paying 2 cost and placing this card as 1 of your [Legend-Arms] or 1 of your level 5 Digimon's bottom digivolution card, therefore the effect can't be activated just by paying 2 cost.
Ruled Sep 6, 2024
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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.