Q1: Do I or my opponent choose the card to be trashed from their hand when I activate this card's On Deletion effect?
Your opponent chooses.
Lv.6 Ravemon EX4-058 SR Mega | Vaccine | Cyborg <Jamming> (This Digimon can't be deleted in battles against Security Digimon.) [End of Attack] By deleting this Digimon that has a digivolution card with [Bird] or [Avian] in one of its traits, at the end of your opponent's turn, play 1 [Ravemon] from your trash without paying the cost. [On Deletion] If your opponent has 8 or more cards in their hand, they trash 1 card in their hand. Then, if your opponent has 7 or fewer cards in their hand, they add the top card of their security stack to their hand.
Lv.6 Ravemon EX4-058 SR Mega | Vaccine | Cyborg <Jamming> (This Digimon can't be deleted in battles against Security Digimon.) [End of Attack] By deleting this Digimon that has a digivolution card with [Bird] or [Avian] in one of its traits, at the end of your opponent's turn, play 1 [Ravemon] from your trash without paying the cost. [On Deletion] If your opponent has 8 or more cards in their hand, they trash 1 card in their hand. Then, if your opponent has 7 or fewer cards in their hand, they add the top card of their security stack to their hand.
Lv.6 Ravemon EX4-058 SR Mega | Vaccine | Cyborg <Jamming> (This Digimon can't be deleted in battles against Security Digimon.) [End of Attack] By deleting this Digimon that has a digivolution card with [Bird] in one of its traits, at the end of your opponent's turn, play 1 [Ravemon] from your trash without paying the cost. [On Deletion] If your opponent has 8 or more cards in their hand, they trash 1 card in their hand. Then, if your opponent has 7 or fewer cards in their hand, they add the top card of their security stack to their hand.
Lv.6 レイヴモン EX4-058 SR 究極体 | ワクチン種 | サイボーグ型 ≪ジャミング≫ 【アタック終了時】特徴に「鳥」を含むカードを進化元に持つこのデジモンを消滅させることで、次の相手のターン終了時、自分のトラッシュから、「レイヴモン」1枚をコストを支払わずに登場させる。 【消滅時】相手の手札が8枚以上なら、相手は相手の手札を1枚破棄する。その後、相手の手札が7枚以下なら、相手は相手のセキュリティを上から1枚手札に加える。