Managed to crash it here finally. Seems like there is a finite number of board resets, haha :) Probably this is around my 100th run of the game, but I am still having fun. I should estimate a winrate. My guess would be around 25% with Knight after the Divine Light update (was over 60% before, too OP), and around 33% with Vampire, which seems stronger for me as basic damage is higher and healing via hero power does not depend on armour.