Wave-1st time (This ability is active during the specified battles of each turn):At the end of the battle that this unit attacked a vanguard, if your vanguard is Legion, choose up to one of your other rear-guards, and you may exchange positions with this unit. If you do, that unit gets +5000 until end of turn, return this unit to your deck, and shuffle your deck. (The state of the card does not change.)