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

This card’s <On Play> effect reveals cards from the top of my deck. Can I only trash a card that has [Undead] or [Dark Animal] in its traits?
Yes. Both the card you add to hand and the card you trash must have [Undead] or [Dark Animal] in their traits.
Ruled Mar 28, 2024
This card’s <On Play> effect reveals cards from the top of my deck. If only one card has [Undead] or [Dark Animal] in its traits, can I choose whether to add it to my hand or trash it?
Yes, you can choose to either add it to your hand or trash it.
Ruled Mar 28, 2024
If I have cards in my trash with [Undead] or [Dark Animal] in their traits, does this card's inherited effect let me digivolve any card into any of them, regardless of digivolution requirements?
No. This effect can’t ignore digivolution requirements. When activating this effect, you can only digivolve into a card with [Undead] or [Dark Animal] in its traits if it also meets the digivolution requirements.
Ruled Mar 28, 2024
I activate this card’s inherited effect to digivolve into a card with a <When Attacking> effect. Does that effect activate immediately?
No. The <When Attacking> effect wasn't present when you declared the attack, so it doesn't 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.