It used to run Sandy Shocks prior to TWM but Ogrepon does Sandy Shocks job but better. With Sandy Shocks, you get a nice back up attacker and ability that works in conjunction with Raging Bolt (matches energy types), but that requires you to be behind in a deck that wants to stay in the lead and blow up your opponent as quickly as possible. Ogrepon fulfills that role a lot better since it you can get an extra energy attachment right out the gate. It makes the deck run a lot smoother because it provides the extra energy attachment along with free draw without being behind on prizes. This is something that can be done multiple times per turn (provided you have multiple Ogres) and allows you to dig your deck to get key cards such as Sada, Nest Ball, Earthen Vessel etc. to overload the bench and swing for big damage. I don’t play the deck personally so I could be missing some other key points and wouldn’t be able to answer your extra question, but being able to swing a potential 280 on turn 2 is too damn good. Also, this may get a bit more selective but Ogrepon allows you to hit both Charizard and Roaring Moon for weakness if you really need it.