This deck gives you good scenarios whenever you go first or second:
First: You can end with a maximum of 3 negates, including Apollou and Hope Harbinger.
Second: You can strike for an OTK using Draglubion and Neo Galaxy-Eyes Tachyon Dragon.
The Side Deck contains cards like Unexpected Dai that can replace the Dinosaur engine if you don't want to use it. You can also replace the Tachyon engine with any strong "Number" XYZ Dragons, like the Heart-eartH engine.
This is my recent strongest deck. Always comment if you have improvements. It helps all of us :)