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

When playing this card, can the [Shoutmon] I place in its digivolution cards for its effect come from my hand, breeding area, or trash?
No, it can't. The effect only allows you to place a [Shoutmon] from the battle area in its digivolution cards.
Ruled Mar 28, 2024
When I activate the "When this card would be played" effect and place [Shoutmon] in this card's digivolution cards, what happens to [Shoutmon]'s digivolution cards?
They're trashed.
Ruled Mar 28, 2024
When this card's effect places [Shoutmon] in this Digimon's digivolution cards, what happens if [Shoutmon] has [BT9-109]/[X Antibody] in its digivolution cards?
It's not being trashed by the effect, it's being trashed because of the rules, so [BT9-109]/[X Antibody] does still get trashed.
Ruled Mar 28, 2024
When I activate the "When this card would be played" effect and place [Shoutmon] in this card's digivolution cards, can I first place cards for DigiXros and only then place [Shoutmon]?
No, you can't. DigiXros is performed after all ""would be played"" effects have activated. Therefore, you must first place [Shoutmon] in its digivolution cards for the effect and then place cards under the [Shoutmon] digivolution card for the DigiXros.
Ruled Mar 28, 2024
[Shoutmon]'s digivolution cards are trashed when I place it in this Digimon's digivolution cards for the "When this card would be played" effect. Can I DigiXros with those trashed cards and place them in this Digimon's digivolution cards?
Yes, you can.
Ruled Mar 28, 2024
What does "∞ Digimon cards w/[Xros Heart]/[Blue Flare] & different card numbers" in this card's DigiXros requirements mean?
It means that you can DigiXros with as many cards as you like, as long as all the cards have the [Xros Heart]/[Blue Flare] and different card numbers.
Ruled Mar 28, 2024
This card's DigiXros requirements say "∞ Digimon cards," but is it still considered DigiXros if I place 0 cards?
No, it's not DigiXros if you don't place any cards.
Ruled Mar 28, 2024
If I place [Shoutmon] as a digivolution card for this card's "When you would play this card" effect, can I place another card with the same number as that [Shoutmon] as a digivolution card under this Digimon for this card's DigiXros?
Yes, you can. A [Shoutmon] placed as a digivolution card for this card's ""When you would play this card"" effect is not treated as placed by the DigiXros, so it is not included in this card's ""different card numbers"" DigiXros condition.
Ruled Mar 28, 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.