Blackwing - Kris the Crack of Dawn

If you control a "Blackwing" monster other than "Blackwing - Kris the Crack of Dawn", you can Special Summon this card (from your hand). You can only Special Summon "Blackwing - Kris the Crack of Dawn" once per turn this way. The first time this card on the field would be destroyed by Spell/Trap effect each turn, it is not destroyed.