Add a feature to undo cards that you have crafted at any time

Personally I really wish cards would craft down for half of the cost it takes to make them rather than a quarter(and rares decrafting for 50 is ridiculous, that's less than 25%). Especially as F2P, but even for P2P, it is very hard to get the cards I need when decrafting 4 legendaries gives me just one that I want. Even a third  of the decrafting cost would be appreciated