It probably does work on Chaos Numbers.
And not being able to summon it, is not an issue if the intention is to prevent your opponent from summoning it. You can't summon it, but at least now your opponent can't either.
I just fought someone who had 3 blue eyes in his hand, and a single cosmic cyclone, and with that beat my entire hand on the fact that his turn was 2 and he pulled the dumbest card but was able to destoy my trap card, and my counter, and then went on to summon neo blue eyes ultimate dragon attacking 3x in a row. I don't know how others overcome that but I am open to criticism.
I know. I recently got back into yugioh and as a kid I used vampires and remember using the Zombie Madness Structure deck. I just want to try a way to use him in the modern era. Not planning on using him seriously. Just want to experiment. I feel like there is something there with Genesis, sorcerer, familiar, and retainer if only there was a reliable way to bring him out.
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Until they finally give us Karukuri's boss synchro monster, I think this card can at least be brought back to semi-limited. The speed of the game faster than when it was limited, and with the array of options decks now have simply negating/banishing this card can stop the deck cold.
Also, fusion substitute only works on specifically named material.
You can't use fusion sub to replace one of the other two AG besides Ancient Gear Golem for the material of Ultimate Golem.
You cannot use fusion sub to replace one of Megaton Golem or Howitzer's material.