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.
| Printing | Rarity | 1st Edition | Unlimited | Actions |
|---|---|---|---|---|
EXVC-EN002Extreme Victory | C | 1st | Unl. | |
LC5D-EN022Legendary Collection 5D's Mega Pack | ScR | 1st | Unl. | |
LED8-EN049Legendary Duelists: Synchro Storm | C | 1st | Unl. | |
SDSE-EN008Synchron Extreme Structure Deck | C | 1st | Unl. |
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