Highly Skilled Shiina (AB/W31-E066 R) [Angel Beats! Re:Edit]

[AUTO][(2)] When you use this card's"Backup", you may pay the cost. If you do, return all cards in your waiting room to your deck. Shuffle your deck afterwards. [ACT] Backup 2500, Level 2 [(1) Put this card from your hand into your waiting room] (Choose one of your characters that is being frontal attacked, and that character gets +2500 power until end of turn.)