It has a very fast, very narrow gameplan: if you can get your Charizard ex in play, you will have the energy to attack with it, and it will hit like a truck, so you best make that happen as fast as you can
No need to worry about accidental spills or disruptions during transport
For the other two fossils, Regirock becomes a key component instead of Marshadow as it allows you to tank hits while you find your full Stage 2 line
Now this is a card I can get behind
Mega Brave was the first MEGA series expansion, alongside Mega Symphonia
While Wild Mongrel might be the primary engine for dropping an early Wurm, the best opening play possible for this deck would be first turn Careful Study, dropping two Basking Rootwallas into play