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

This card’s effect reveals 4 cards. If the cards revealed only include either a card with [Beelzemon] or [Ai & Mako], can I still add a card to my hand?
Yes, as long as either a card with [Beelzemon] or [Ai & Mako] is among the cards revealed, you can add it to your hand.
Ruled Mar 28, 2024
This card’s effect reveals 4 cards. If both a card with [Beelzemon] and [Ai & Mako] are among the cards revealed, can I choose to only add one of them to my hand, and place the remaining card at the bottom of my deck?
No. This card's effect reads “Add 1 card [...] among them to your hand,” so you must add as many cards to your hand as possible. In this case, you must add both 1 card with [Beelzemon], and 1 [Ai & Mako] to your hand.
Ruled Mar 28, 2024
An effect that reads, “Reveal a card from your deck” reveals this card and trashes it. Does this card's “When this card is trashed from your deck” effect activate?
No, cards revealed from the top of your deck aren't considered to be “trashed from your deck,” so this card’s effect doesn’t activate.
Ruled Mar 28, 2024
If the effect of [BT2-068]/[Impmon] trashes this card from my deck, does this card’s “When this card is trashed from your deck” effect activate?
Yes. This effect specifies a specific card number (EX2-039 Impmon), so as long as the effect is from a card with a different card number, the effect will activate.
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.