yugioh deck building theory

yugioh deck building theory Sorry if this has been asked before, but what is The Grand Unified Duel in reference to? All the other final classes are referencing one of the previous series, but I Theory of Competitive Yu-Gi-Oh! #4:

Name: yugioh deck building theory Sorry if this has been asked before, but what is The Grand Unified Duel in reference to? All the other final classes are referencing one of the previous series, but I Theory of Competitive Yu-Gi-Oh! #4:
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One Pokemon GO s10b Japanese Booster Box

Theres also Yarok, the Desecrated as a trigger doubler, and youre in the right colors for other lands-matter cards like Teval, the Balanced Scale and The Gitrog Monster