Q1: Can the Your Turn effect of this card change the target of attack to a Digimon with "not attacked" effect or an active opponent's Digimon?
Yes, it is possible. If the target of attack is changed by an effect after the attack is declared, it is possible to change the target of attack to a Digimon that has an "unattacked" effect or to an active opponent's Digimon.
Shoto Kazama ST18-14 R LIBERATOR [Start of Your Turn] If you have 2 or less memory, set it to 3. [Your Turn] When any of your Digimon attack your opponent's Digimon, by suspending this Tamer, you may change the attack target to another of your opponent's Digimon or a player. --- [Security] Play this card without paying the cost.
Shoto Kazama ST18-14 R LIBERATOR [Start of Your Turn] If you have 2 or less memory, set it to 3. [Your Turn] When any of your Digimon attack your opponent's Digimon, by suspending this Tamer, you may change the attack target to another of your opponent's Digimon or a player. --- [Security] Play this card without paying the cost.
Shoto Kazama ST18-14 R LIBERATOR [Start of Your Turn] If you have 2 or less memory, set it to 3. [Your Turn] When one of your Digimon attacks your opponent's Digimon, by suspending this Tamer, you may change the attack target to another of your opponent's Digimon or the player. --- [Security] Play this card without paying the cost.
風真照人 ST18-14 R リベレイター 【自分のターン開始時】メモリーが2以下なら、3にする。 【自分のターン】自分のデジモンが相手のデジモンにアタックしたとき、このテイマーをレストさせることで、アタックの対象を他の相手のデジモンかプレイヤーに変更する。 --- 【セキュリティ】このカードをコストを支払わずに登場させる。