Authority: Community discussion
Official ruling confirmed: unknown
Source: Reddit: r/Yugioh101
Link: https://www.reddit.com/r/Yugioh101/comments/1wj1mal/can_number_23_lancelot_dark_knight_of_the/
Format: TCG
Status: resolved
Date: 18 September 2026

1. Question

A player asked on Reddit whether Number 23: Lancelot, Dark Knight of the Underworld can negate Super Polymerization.

The question was whether Lancelot’s effect could be used to respond to the activation of Super Polymerization.

2. Reddit Discussion

The Reddit responses consistently answered no.

One commenter explained that Super Polymerization cannot be responded to, meaning another effect cannot be activated directly in response to its activation.

Another commenter specifically noted that Lancelot’s effect needs to activate in response to the relevant activation. Because Super Polymerization prevents effects from being activated in response to it, Lancelot cannot use its effect to negate it.

A third commenter gave the same explanation: Super Polymerization does not allow any effect to activate in response.

3. Summary of the Reddit Answer

Question	Reddit Answer
Can Lancelot activate its effect in response to Super Polymerization?	No
Can Lancelot negate Super Polymerization?	No
Why?	Super Polymerization does not allow effects to be activated in response to its activation
Does Lancelot’s effect being a negation effect change this?	No

The key point in the discussion is that Lancelot cannot activate its effect in the response window created by Super Polymerization.

4. Conclusion

According to the Reddit discussion, Number 23: Lancelot, Dark Knight of the Underworld cannot negate Super Polymerization.

The reason given by all three responses is that Super Polymerization prevents effects from being activated in response to its activation. Since Lancelot’s negation effect must be activated in response, it cannot be used against Super Polymerization.

This post documents the Reddit discussion and its explanation. The supplied discussion does not include a direct official Konami ruling, so the answer should not be presented as an independently verified official ruling.