I must say that the card system is very difficult to get properly into.
The layered RNG is annoying to say the least:
-> The correct card has to drop
-> additional cards must drop for materials
-> stats must be added
-> stats must be rerolled
The last three steps are repeated ad infinitum to gain the best cards. Considering the card system is supposed to be widened throughout all the zones, imperfect cards will then cost about ~2400 attributes and ~10k attack (unbuffed). Mind you, this is when all zones are introduced.
Remove some rng with rolling the stats. Remove the entirely of rolling the attribute values or at least narrow them down to whole numbers. Get rid of the commas, please.
In addition, a mechanic that let's people target-farm some materials, not cards themselves, would make it much easier for the average joe to get into the game (and if it's an early game friendly thing, even help newbies get into CoA.)
Merkur and many others are 100% correct when they say that there is too much RNG. This randomness needlessly complicates an (otherwise) pretty damn good system. The idea is really great and the feeling of reading in a direct card upgrade is damn nice.
To condense the (EDIT: MY PROPOSITION. Merkur posted something while I was writing and I am not referring to his post!) proposition:
1) Remove the decimal point of the card values
2) Add a mechanic where players can targetfarm card currencies
These two things would make the system much more accessible without directly impacting the grind that the system is supposed to be.