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

Summary

You Feng performs a series of synchro summons during a duel, showcasing his unique deck and strategies. He first summons the 2-star monster Assault Kuroha, followed by the powerful 11-star monster Liu Tian Jiu Shi Xing Long, which resembles Katsuya Jonouchi, amusing the audience. You Feng then liberates a 4-star monster and summons Xing Chen Tong Tiao Shi, followed by the Waste Product Synchro Soldier, setting up for a significant move. As the crowd reacts with shock and excitement, You Cheng Shi Dai predicts that You Feng will summon a powerful 12-star dragon. You Feng surprises everyone by preparing to summon the Cosmic Star Dragon, a fusion of two powerful dragons, hinting at a grand finale in his duel. He concludes by summoning the 5-star Yuan Long Xing - Wang Tian Hou, further demonstrating his skill and creativity in the game.

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