Thanks, I will play a bit with values. IMO the damage offer should be flagged every 50 or so battle rounds. If not offered between 0-50, offer at 51, 101, 151 and so on.
Because right now, is a really matter of luck (the 1/49 chance is extremely tiny). Several games already, was never offered damage until turn 200 or so. Having a commander with 9000 Hp and 20 damage makes no sense, I would prefer luck combined with statistics.
Edit: are you sure about the code to change? It seems I unlocked an ability not used until now.