Also, some thoughts after reading and testing all the changes from my end:
-> The system as it is is great. Having less stones is awesome and the way you upgrade is cool. And it is content to do. So a big thank you for that!
Onto the more frustrating parts:
-> To maximize cards you will need a lot of those "Breakthrough" Stones. And i am talking like around 30-open end for a general card (which most of the new cards in the game are). I got those from my personal green shop actually (despite it being an orange stone) and if it is intended to get them from your green shop every day that is perfect. However i suggest to make the stone give a lot more points to the attributes. For example something like 0.5 to every secondary and 0.3 to every main attribute on a card.
-> Another very big issue i see is that there are very good ways to farm for green and blue dust but it is very frustrating to farm purple and orange dust. If "Breakthrough" stones are aquired by your green shop, the purple items you need for upgrading should be made available in your blue shopevery day. Or you rethink the whole dust currency and make it only one type of dust or something.
Tldr:
System: rly cool!
Breakthrough stones: need a buff!
Currency farming: needs to be buffed/adjusted!
~kind regards Noodlez