Top 10 Characters to Farm

Phoenix: With three characters (Hera, Ezra, Chopper) locked behind cantina energy, and with the crystal subscription just discontinued, this is going to be a lengthier farm than others. Unless you are among the top payouts in the arena, you're not going to be able to buy crystal refreshes because you need all your crystals for 3x50 energy refreshes. That leaves you very little cantina energy to work with for unlocking three of six chars (of which one is another slow single hard node/guild shipment farm - Sabine).

I believe this will take you farther faster:

https://forums.galaxy-of-heroes.starwars.ea.com/discussion/86926/adaptive-f2p-guide/p1