What happens if this card has just BT15-086 [Marvin Jackson] in its digivolution cards, it performs a security check on a face-up security card, and this card's [Your Turn] effect activates?
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Official Ruling
This card stacked on top is gone, causing this Digimon to become a Tamer, therefore the attacking Digimon will no longer be present.
Source: BT20-052 Oblivimon