The only thing Dark World needs now for support is the Danger! archetype. Although that archetype would help a lot more than just Dark World. It might even be too broken to add in. They would have to almost immediately put each one at Limit 1 or Limit 2. lol
Dark World isn't garbage. Grapha is a big deal to get since it can destroy anything, is a decent beater with their field spell, and is easy to get on the board. Danger! cards would just be a bigger help since they're powerful monster cards that also have discarding as part of their effects instead of costs.