By Advancing- that is the only way.
As an example, let's say you have a GREAT deck- like, CHAMP lb quality deck
But
for one season, you stay in Gold- the whole season
THEN
the next season you just.... GO!!! It won't take long to climb up into Champs and even up to the 'average' rating for Champs (Since you have a GREAT deck)
Well, once you 'rest' your account for a day or two to recover your ECR.... Every win is, basically, a chest
Play 30 games/day
Win 10/day
15 day Season- 150 (Gold) chests at EOS

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