This is what happens, by timing coincidence, but it was not a purposeful decision. I joined the game during Souldance so I only worked up to enough resources to get the festive and Draconics in Eclipse.
I’m still figuring out a chest strategy.
Souldance: First season, no mythic (for the obvious reason) but I did save Bronze and Gold chests the last 4-5 weeks.
Eclipse: Using the saved chests I was able to get Quasar, but it was a near thing, leaving me very few Bronze/Gold chests. Fortunately, I was able to buy 400-500 Draconics.
Celestial Rift: Used the Draconics to get through the discount dragon and about half of base boost. This put Xul in comfortable reach and I saved Gold chests all season after the discount and most of my Bronze
Aftermath: With Gold, Bronze, and Platinum chests, I was able to get through both discount branches and save some of the Gold chests I got from event prizes (the previous season I had opened all the Gold chests I got from season prizes during the discount). Got Kinnarix very comfortably, I’ll probably have some rubies left over after getting 600 chests.
Strangelands: This will be the first season I have a cache of Draconics and Gold/Bronze/Plat chests. My plan is to open the Draconics and Platinum during Fort, open what Gold I need to finish the discount lines during week 2, then sit on the rest. I’m going to try and save up 15k-20k Bronze chests then open them in a Breeding event during the discount weeks one or two seasons later, since I like opening Bronze during Breeding. Long term I’d like the Gold chest horde to swell and maybe facilitate a double mythic season down the road…?