Junk Mail

“A Synchro Monster that used this card as material cannot be destroyed by battle. If this card is in your GY, except the turn it was sent there, and you control a Synchro Monster with "Warrior", "Synchron", or "Stardust" in its original name: You can Special Summon this card, but banish it when it leaves the field. You can only use this effect of "Junk Mail" once per turn.”