There was a lot going on between the dragons theme, all five allied color pairs each having their own mechanic, Megamorph adding complexity and an increased focus on three drop creatures, and the final pack of Fate Reforged adding plentiful bombs and introducing enemy color themes
If you only want official art and clean Oracle text, Scryfall is the best starting point to look up card images and rules text
Scourge already gets a +1/+1 counter for attacking the player on the throne, but an entire extra combat is a huge bonus
This guide is here to clarify everything
Its joined by Brute Bonnet and an Ancient Booster Energy Capsulesomething your past self would want you to have
One deck I can see it immediately being played in is Coalossal VMAX, since that deck doesnt need too many cards to function and absolutely cannot afford to bench Dedenne GX