The best part of promoting up the leagues is that you get more rewards chests and while on most days the rewards are pretty bad, some days you get cards that are pretty good. The Venari Wavesmith is one of my favorite rare cards in the new collection so always happy when I get one.
It was the sneak quest today which unfortunately, might mean extra battles because when it is paired with some of the rules, I don't have any sneak card to play. That was a big source of frustration earlier but now only the newer quests have them apparently.
Opponents are pretty tough in Silver II and I often drop down before fighting my way back up. Should finish the season in Silver I unless something goes awry.