If your opponent controls a monster and you control no monsters, you can Special Summon this card (from your hand). You can only Special Summon "Unknown Synchron" once per Duel this way.
Appears in Card Sets
Extreme Victory - Common (EXVC-EN002)
Legendary Collection 5D's Mega Pack - Secret Rare (LC5D-EN022)
Legendary Duelists: Synchro Storm - Common (LED8-EN049)
Synchron Extreme Structure Deck - Common (SDSE-EN008)
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