B2 Battle Droid: Average cost to 7*?

"Paromos;452783" wrote:
I have enough to get him to G9, I made sure I have all of the gear.

I have already put 300$ into Chromiums, and have 10 chromium exclusives at 4*s.

Lea, Echo, Sun fac, and Rex I think I would be able to 7*.

Probably not Rex he barely drops for me and a friend, also remember 4* is only 25% of the total shards needed to 7*. Sun Fac and Echo for sure will be 7* first.