Etali, Primal Conqueror It's kind of a joke that Etali, Primal Sickness has the Blightsteel Colossus style back-side, because Etali, Primal Conqueror is already an absurd card
Provenance and history A card with a story to tell is worth more than one without provenance
You could use that card on its own since it can do up to 130 damage a turn but if you want some major power in your deck, I would highly recommend setting up Mega Rayquaza on the bench and even getting more than 5 energy cards on this card or figuring out a way to quickly attack an energy card to Rayquaza or even two energy cards to it, while also being able to attach energy cards to other Pokemon, that way, you can knock out any Pokemon your opponent puts out there in one move for sure
This deck is the TCG equivalent of Structure Deck R: Machine Dragon Re-Volt in the OCG
The Digimon anime had that spiky early 2000s style that all Y2K kids know and love, and the 1999 Selected Kids