115% of probability of sofa sleeper waking up after three successfully given cards looks like serious threat)
And my most epic hit - 192 dmg by devil * (22 from card value + 10 from Jack of all trades). Even thought about theoretical maximum damage, but looks like it is almost unlimited due to the possibility of huge negative values of cards by multiple apply of break limits card over and Chariot/Strength that could stop the enemy far before limit