Card Rulings:Cyber Dragon
- You can only use the effect of "Cyber Dragon" to Special Summon itself during your Main Phase.
- The effect of "Cyber Dragon" does not start a chain.
- You can negate the Special Summon of "Cyber Dragon" with "Royal Oppression", "Solemn Judgment", or "Horn of Heaven".
UDE FAQs
- You can use the effect of "Cyber Dragon" to Special Summon itself when your opponent controls multiple monsters.source
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OCG Rulings
- This card's effect would check when you choose to activate it, or, even if opponent would sacrifice his/her monster at your turn (and that's the only monster he/she has), this card can still be special summon.