Among the sub-themes, we can point out a focus on high Willpower characters, since they survive many Challenges throughout the game, and a direct Lore gain through Challenges - which means that, in this decks, Challenges not only help with board control but also become your win condition
One other Rare, One Last Hope, seems like the kind of card that will be essential in both Sapphire/Steel and Ruby/Steel challenger decks
Each deck can have one or two Ink colors, so I imagine Amethyst will be a popular choice to pair with one of the others, if only for the card draw options
This works out great sometimes but if they know what you need to do, your opponent can play around it
The front is mattetransparent for glarefree play