1: a no double's rule.
2: a min of 12 cards needed
3: a mini of 40 star - 50 star max limit.
4: the timer should be shorter like tourney short. cause in a survival situation you don't have time to think you must act a n act fast. i see its about 1 min each round that's prity fast.
5: no card band
6: massive punishment for if you bail on more then a set amount of battles in a row.aka bailing on a fight.
You might do better replacing Vladimir and Gork with Draheera and Darling or Hriger. 5* aren't necessarily optimal, and Vladimir is crap
My example of Kenny and Vholt was just that - an example. Sure maybe you could escape such a situation sometimes, but sometimes a life gap of 15 with your cards damage reduced by 6 in the next 3 rounds will be insurmountable: you'll know as soon as round 1 is up that you've lost. My point is you don't gain anything from staying, and most of the time (except if mission grinding) neither does the opponent