If this card’s [End of Your Turn] effect gains me enough memory to bring the memory gauge to 0 or greater on my side, does it briefly become my opponent’s turn before switching back to my turn again?
No. In this case, your turn simply continues without switching over.
Mar. 28, 2024
If [BT9-109 X Antibody] is in this card’s digivolution cards, can this card’s [End of Your Turn] effect return [BT9-109 X Antibody] from this card’s digivolution cards to the bottom of my deck?
Yes. You're not trashing it, so there’s nothing preventing you from returning it to your deck.
Mar. 28, 2024