Looks pretty cool and very unique. Awesome!
Although I have one complaint, you should either make "The Ultimate Block" have a more expensive recipe, or it has a right click ability that lasts for at least 10 or 20 seconds and has a cooldown of 500 seconds.
It really is OP.
It should be a dragon egg a nether star a diamond block an emerald block and a gold block and so that it doesn't use the egg