When this card you control is destroyed by your opponent's card (either by battle or by card effect) and sent to the Graveyard, you can select 1 "Stardust Dragon" in your Graveyard and Special Summon it in face-up Defense Position. You can remove from play this card from your Graveyard to select 1 face-up Dragon-Type Synchro Monster you control. Once per turn, that Synchro Monster cannot be destroyed by battle. At the end of each Damage Step this effect is applied, that Synchro Monster loses 800 ATK and DEF.