In Yu-Gi-Oh, but Mechanical Ascension (1-148).

Summary

In this chapter, You Feng activates the powerful Spell Card "Super-Polymerization" to fuse the "Dark Magician" and his opponent's "Red-Eyes Black Dragon," summoning the formidable "Super Magician Dragon Knight - Red-Eyes Dragon Knight." As the duel progresses, You Feng demonstrates his strategic prowess, using the knight's effect to destroy his opponent's monsters and deal significant damage. Despite the opponent, "DARKNESS," attempting to counter with his own cards, You Feng's tactics lead to an overwhelming victory, culminating in a one-turn knockout (OTK) by leveraging the bond between the Red-Eyes and Dark Magician. The chapter concludes with DARKNESS acknowledging You Feng's power and returning a soul to him, signifying a deeper connection in the duel.

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