This comp looks to find a Chosen Janna with Mystic in order to reach 4 Mystic 4 Enlightened. A Chosen Talon with Assassin can also be used, but you will need to replace a Mystic or Yone for another Assassin to hit 4 Assassin.
Ideally by now you will have the ideal Chosen Janna. With this, you can look to add in Enlightened with an mid game unit like Irelia.
Additional comp tips
This comp can be difficult to transition into since Enlightened units don't fare well in the early game. As such, run any strong units you find early to eventually transition into the comp.
Janna with Blue Buff is extremely powerful if you find her Chosen. This allows her mana pool to decrease, making her cast very often. You should also try to 3 star Janna while rolling at level 7 as she is extremely potent as a Chosen 3 star unit.