Divine Sister, Sorbet

[AUTO](RC):At the end of the battle this unit boosted, if your unit was placed on (RC) by your vanguard's ability this turn, [COST][retire this unit], choose a grade 3 or greater card with "Sarevsael" in its card name from your soul or drop, and put it on the bottom of the deck. If you chose a card, choose one of your rear-guards, and it gets [Power] +10000 until end of turn.