I'm doing a few tests myself. I've tried pakkun (it's released in turn 3, when i still have all buffs + shisui's barrier + treasure dmg amp bonus) and it consistently crits at around 650k damage, which more or less is the damage of my main mystery.

I'll try tomorrow gamachu.

I'm not really sure about the monkey king, the double auto on main + additional mystery turn 4 increase the total time before the end of the round, but the damage could be well worth it.