While each card has an icon in the top left corner to define if it's the front or the back (such as Innistrad-based sets using a Sun and a Moon, or Ixalan having a compass and a mountain), the front face is always the one with the mana cost
Jokes in this set range from Magic in-jokes like Look at Me, I'm the DCI, a joke about how seemingly random Magics banned list policy was, or Urza's Contact Lenses, poking fun at the fact that there are a lot of cards in the game that depict items that Urza once owned, to downright absurd cards like Charm School that tell you to balance a card on your head
Making this cost just double green doesnt sound totally implausible, and even if it only costs 5 or 6, its still a very strong play
He activates the second ability of Devoted Druid
The same goes for the following section