Talk:Season 5 Championship/@comment-2601:644:8301:749F:E9B5:225D:4250:844A-20180713190310/@comment-32545704-20180713193243

Cheapest upgrade path is 333333 costing 298 GC. Then you get 70 GC back in rewards, so 228GC in total.

For future LTS you could bookmark this page (there is also a link at the top of this page):

RR3 Wiki:Upgrade Strategy Limited Time Series