Dracmon

Q: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?

A:Yes. Both the card you add to hand and the card you trash must have [Undead] or [Dark Animal] in their traits.

Q:This card’s [On Play] effect reveals cards from the top of my deck. If only 1 card has [Undead] or [Dark Animal] in its traits, can I choose whether to add it to my hand or trash it?

A:No. For this card's effect you reveal cards, add 1 card with [Undead] or [Dark Animal] in its traits among them to your hand, then trash 1 card with [Undead] or [Dark Animal] in its traits among them.Therefore, if there is only 1 card with [Undead] or [Dark Animal] in its traits among the revealed cards, it's first added to the hand, so you can't trash it.

Q: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?

A: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.

Q:I activate this card’s inherited effect to digivolve into a card with a [When Attacking] effect. Does that effect activate immediately?

A:No. The [When Attacking] effect wasn't present when you declared the attack, so it doesn't activate.