I'm still thinking of the mechanics of deck building - I'd like to keep the common/uncommon/rare feature if possible but I don't really know how to go about doing it without putting unnecessary limitations on the players. I might ultimately abandon that whole notion.
One method could be to assign "points" to each card during a new deck building phase. Commons "cost" 1 point, uncommons 2 points, rares 3 points, or whatever makes sense. There could be a default where players each get to build/bring 100-point decks in (which would work out to 30 commons, 20 uncommons and 10 rares, or some other comparable combination that falls under the limit). If players wanted more flexibility, they could raise the limit to 150 points and bring in 10 commons, 20 uncommons or 30 rares. With this model, each player may have different total numbers of cards in their deck. At 200 points they'd have significant customization (60+ rares or some huge number of commons/uncommons and a handful of rares).
Another model, if the engine supports it, would be to literally apply a rarity to the draw pile. Rather than a random assortment, common cards have a greater likelihood of showing up earlier in the game. Rares would be unlikely to be drawn initially, but would increase in likelihood as the commons/uncommons are drawn. The drawback of course is that if the deck is entirely comprised of Rares, then they're all equally likely to come up.
But this could be combined with my first model or perhaps with some forced distributions of common/uncommon/rare quantities in a deck (take a small number of rares, get an increased chance to see them early on in play. take a large number of rares up to a set limit quantity and the rares are more likely to be drawn later in the game).
In regards to your Damaged text overlay, you might want to try a thin black outline around the letters so that they contrast with the card images more.
