Apex Dragon Mage, Kinnara

/:Blaze (At the beginning of each of your attacks, if you have more rear-guards than your opponent, your vanguard becomes blazing until end of turn) :[ 1 & Put this unit into your soul] At the end of the battle that this unit attacked, if your vanguard is blazing, you may pay the cost. If you do, choose one of your opponent's grade 1 or greater rear-guards, and retire it.