Im happy for you. You are going to always be grinding for that. I cant even safely defeat the second, third, and fourth citizens, although i can beat them if i get the right first hand (proof as i have the hero cards). The AI is over powered, and even with my strong deck, its a 25% chance of a win. Until the gachas start giving me blue cards to evolve with, im going to keep logging on and getting that legendary. Right now, im making maxed out trainers and diamond rings.
NOTE: Get the Adventure 3, star 12 hero LISA. She is still kind of weak, but at least has bdsm, and is a great support. She doesnt fuse, but if you can protect her in the 2nd or 3rd lane, can just chip away at the enemy health. (same with any bdsm card)