This card cannot be used as a Synchro Material Monster, except for the Synchro Summon of a Level 7 or higher Synchro Monster. Once per turn, that Synchro Monster cannot be destroyed by battle. Each time this effect is applied, that Synchro Monster loses 400 ATK and DEF at the end of the Damage Step.
Stardust Dragon has the abilitiy to leave the field when he negates your opponent’s effect destruction. This resets all the debuffs he has accumulated. Additionally he could be hard to get rid of with his effect destruction negation with Trust Guardian’s battle protection.