Since training grounds is the only unlimited daily event, is it possible to raise gains to 20 for each card?
Before they introduced the system that cards can gain XP, it used to take 5 matches to master common cards in TG. After the introduction of the card XP system, cards only gained 6 XP per match. I immediately requested the same as you are doing now. Before, I used TG to try some new cards and also to master them, now, I don’t play TG at all anymore.
Alternate suggestion: let repeatable matches in PvE events like Routes of Ravnica continue to give 20 points for each win, instead of just the first of each node.
OK… it’s Sunday and I want to master cards now. But wait… only training grounds available. I would be a moron to try mastering now. FIX THIS!