Darth Sonic
I think people are missing part of the joke here. Yes, this comic is obviously a fart joke, but it's not trying to imply that G5 is going to be nothing but fart jokes. Rather, it's making a fart joke out of the fact that G5 Earth Ponies (and I presume thee other tribes as well, but they aren't relevant here) can cast Cutie Mark spells with their Cutie Marks. These spells are based upon their Special Talents, and seeing as Earth Pony Twilight has the same CM as G4 Twi, that most likely means Earth Pony Twilight can essentially cheat and use her Cutie Mark like a Unicorn horn because her Special Talent is Magic..
The joke here is that, like a fart, G5 Twilight literally pulls magic out of her ass.
The joke here is that, like a fart, G5 Twilight literally pulls magic out of her ass.