If I have a Digimon card with the [Royal Knight] trait in my hand, do I have to place it under my [Yggdrasill_7D6] in the breeding area as its bottom digivolution card for this card's [On Deletion] effect?
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Official Ruling
No. The cards in your hand count as private information, so you don't have to place that card.
Source: BT13-093 Omekamon