This is going to be the first iteration, so I'm not going to be super critical. It looks to be bunches of fun.
However, the fact that there are no limits to golds or silvers, I think, will be very problematic. People will get extremely salty when they get no good cards, or go against over a dozen golds and silvers. Once the "new" novelty wares off, that will probably be the first thing people will complain about.
I honestly think a better system would be 15 bronze, 6 silver, 4 gold. You draft bronze first, then silver, then gold, then leader. All the other rules still apply. I think this would allow people to better understand what they're up against, in addition to preventing major defeats that could occur with 10+ golds and silvers.
But again, it's not a super critical thing because we have no idea how it will pan out until it releases. This is just my assumption.