The addition of a Perk system similar to runes could be a nice touch.
It would allow you to further enhance your strategy and playstyle, and add some new flavor to the game.
Imagine that, having perk slots, 3 perk slots that may be occupied by different perks, which could be:
+1 starting life, +1 starting pill, +10 extra seconds on the timer, +1 extra star, +4 attk on all courage rounds, +4 attack on all reprisal rounds, +2 attk on all rounds, +8 attk on the last round, +8 attk on the first round,
efeat:+1life etc, imagine suddenly all strategies might get more complex, and formulating a deck can get a lot more fun.
BTW, it would be nice to have perks be given when reaching certain levels, that way NEW PLAYERS have motivation, to keep playing once they start, possible rewards, and costumization options would make a very great(and addictive) addition to the UR universe. I know the leaders exist, and they are very similar to this, but it also feels, like it wasnt a success.
The perks i suggested are just examples(anyone is welcomed to come up with better examples), i know this might not be very original but it would not have a huge impact on card prices, and even if it doesnt make a huge change on the current game, it will still add an addictive element to the game.
The perks, plus the Leader
cards, can be stimulating for new players, and it helps them get into the game.
Ofc perk free modes can be made, and maybe one day(if this happens) ELO
might see perks.