Niv-Mizzet has a couple of ways to make it work, but the concept is very simple
Sometimes you have clunky draws with multiple Traverse, Ishkanah and few removal spells and you need to hit delirium, so you need some card that does that pretty much by itself (Demon,Vessel), or you have draft deck with Lay of the Land, Thraben Purebloods and removal spells
As of this writing, the Unfinity set is the only set to feature this foil style, making it highly collectible
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Getting a role token does make a difference, and a card like this also triggers Celebration, so it does some nice stuff for a couple different decks in the format
Why does Universes Within exist