- If the Special Summon of this card by its effect is negated, you cannot use the effect of an Unknown Synchron again during the same Duel.
- When this card is Special Summoned using its own effect, "Solemn Judgment" can negate the Special Summon.
- Even if the Special Summon of "Unknown Synchron" is negated by "Solemn Judgment", you cannot Special Summon another "Unknown Synchron" using its own effect during the same Duel.
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