Untradable Cards bought and activated can't be put in shards
This is really frustrating—cards bought and activated can’t be converted into shards."
Forum Discussion
I missed that update bro.. but don't understand why such rule. I can't buy gems with coins, shards with coins, good cards with coins and finally now they are closing indirect route to get some shards so that we can use the coins we got. Really ridiculous, I always thought it could be a bug :(