Unknown Synchron is a Common Tuner Monster card from Yu-Gi-Oh! (Synchron Extreme Structure Deck, SDSE). Current market price: $0.08.
Common
Synchron Extreme Structure Deck (SDSE)
Card Text
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.
