You now have two options, XYZ for 3 (probably Leviair since most Dark based decks can quickly stack up banish monsters like Birdman, Plaguespreader Zombie, or even the Peten the Dark Clown you just banished to make this play happen) or Synchro for 6
it loses ATK equal to the discarded monster's original ATK
There are drawbacks to Hypergenesis as well, like needing to fill your deck with super-expensive cards that you aren't going to be able to cast fairly if your opponent can shut down your plan of cascading into Hypergenesis, which is a real risk in a format where Teferi, Time Raveler, Chalice of the Void, and Force of Negation are among the most played cards in the format
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