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

How many [Machinedramon] cards can I place under this card when I DigiXros it?
1 card. Unless specified otherwise, you can only place 1 of each of the cards shown in the DigiXros requirements.
Ruled Sep 6, 2024
Does "cards from your trash may also be placed for this card's DigiXros" mean that I can place cards from my hand, battle area, and/or trash for the DigiXros?
Yes, that's correct. In addition to Digimon from the hand or battle area, you may also place cards from the trash for the DigiXros.
Ruled Sep 6, 2024
What does this card's "when [...] would leave the battle area" mean, exactly?
"When [...] would leave the battle area" refers to when this Digimon is placed in the trash, returned to the hand/deck, placed in the security stack, moved to the breeding area, or placed under another card.
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.