After the Ender Dragon!

So since after defeating the Ender Dragon, you get a Dragon Egg that's pretty useless, I think a use for it could be: First, you collect it, you must also have a Nether Star from The Wither. And then, you go back to The End (if you weren't already there), teleport to The End City, collect the Dragon Head, go back, return to The End, place the Dragon Head on top of the bedrock stand in the middle, place the Dragon Egg on top, and drop down the Nether Star, and respawn the Ender Dragon (use 4 End Crystals) and you get the Ultimate Ender Dragon with +500 more health. And after you defeat the Ultimate Ender Dragon, you get the End Pickaxe, which can mine anything.