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Wormmon is also a possible partner, though you have to wait awhile for a shot at getting him
This is where a lot of the value in the set resides, with cards like Enduring Innocence, Meathook Massacre II, Kaito, Bane of Nightmares, and all of the Verge lands (Gloomlake Verge, Floodfarm Verge, Blazemire Verge, Thornspire Verge, and Hushwood Verge)
However, you will probably never see this card in a serious deck, not even in a Dark Magician Deck (which is basically the same thing, as Dark Magician decks are simply bad)
With his inherent ability to double all of its casters mill effects, it seems as though Bruvac the Grandiloquent would be a shoo-in for any mill decks relying on blue mana
This is going to be a staple in every format it's legal in forever, both because it's fun and because being able to deck check if your opponent has an answer in hand or just loses on the spot is wildly good