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

Is it true that both the Digimon card and the Tamer card must have the [Xros Heart] in order for this card's effect to be able to add them to my hand?
Yes, that's correct.
Ruled Mar 28, 2024
This card’s effect reveals 3 cards. If the cards revealed only include either a Digimon card or a Tamer card with the [Xros Heart], can I still add a card to my hand?
Yes, as long as either a Digimon card with the [Xros Heart] or a Tamer card with the [Xros Heart] is among the cards revealed, you can add it to your hand.
Ruled Mar 28, 2024
This card's effect reveals 3 cards. If both Digimon and Tamer cards with the [Xros Heart] are among the cards revealed, can I choose to only add one of them to my hand, and place the remaining cards at the bottom of my deck?
No. This card's effect reads “Add 1 Digimon card and 1 Tamer card [...] among them to your hand,” so you must add as many cards to your hand as possible.
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.