If a Rescue-ACE monster(s) is Normal or Special Summoned to your field, except Rescue-ACE Fire Engine (except during the Damage Step): You can Special Summon this card from your hand. If a monster(s) is Special Summoned to your opponent s field (except during the Damage Step): You can Special Summon 1 Level 4 or lower Rescue-ACE monster from your hand, Deck, or GY. You can only use each effect of Rescue-ACE Fire Engine once per turn.